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Tomato pomace, tomato skins and tomato seeds

Datasheet

Description
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Common names 

Tomato, tomate

Products:

  • Fresh tomato pomace, fresh tomato pulp, dried tomato pomace, dried tomato pulp, tomato waste
  • Tomato skins, tomato peels
  • Tomato seeds
Synonyms 

Lycopersicon esculentum f. pyriforme (Dunal) C. H. Müll., Lycopersicon esculentum var. commune L. H. Bailey, Lycopersicon esculentum var. grandifolium L. H. Bailey, Lycopersicon esculentum var. pyriforme (Dunal) L. H. Bailey, Lycopersicon esculentum var. validum L. H. Bailey, Lycopersicon lycopersicum (L.) H. Karst., Lycopersicon lycopersicum var. cerasiforme auct., Lycopersicon lycopersicum var. pyriforme auct., Lycopersicon pyriforme Dunal, Solanum lycopersicum L.

Description 

Tomato (Lycopersicon esculentum Mill.) is one of the major vegetables and second only to potatoes in terms of world production (FAO, 2011). While the majority of tomatoes are sold fresh, a little more than one third of the production is processed to make canned tomatoes, tomato juice, tomato paste or puree, sauces and ketchup (click here for diagram of Tomato processing).

Tomato processing yields the following by-products, which represent 5-13% of the whole tomato (Ventura et al., 2009; del Valle et al., 2007; NRC, 1983; Göhl, 1982):

  • Pomace is the mixture of tomato peels, crushed seeds and small amounts of pulp that remains after the processing of tomato for juice, paste and ketchup (Ventura et al., 2009). Tomato paste being the primary tomato product produced worldwide, tomato pomace is the main tomato by-product available for animal feed (USDA, 1994 cited by OECD, 2008).
  • Skins (peels) are a by-product of the peeling of tomatoes used for canning. Skins can be removed by steam-processing, treated with liquid N or treated with NaOH (Knoblich et al., 2005, Cotte, 2000).
  • Tomato seeds are a by-product of tomato cannery, notably from the production of de-seeded canned tomatoes (Cotte, 2000).

In addition to the above by-products, the tomato industries also produces cull tomatoes, tomato leaves and tomato seed cake, which are described in their respective datasheets.

Fresh tomato by-products have the same drawbacks as other high-moisture feed ingredients: they are costly to transport, they spoil quickly, their nutritive value per kg fresh matter is low and their bulkiness limits intake (Cotte, 2000). For those reasons, tomato pomace, skins and seeds are usually ensiled or dried form before being fed ruminants, poultry and other livestock. They may be particularly helpful during dry periods where other feeds are short (Poore, 2008).

Distribution 

World tomato production was 152 million tons in 2009. The main tomato producers were China, USA, India, Turkey, Egypt, Italy, Iran, Spain, Brazil and Mexico (75 % of the world production (FAO, 2011). More than a third of this production is grown for the processing industry, which makes tomatoes the world’s leading vegetable for processing (Tomato News, 2010). In 2007, tomato wastes were estimated to at 11 million tons, including a little more than 4 million tons of tomato pomace (FAO, 2011; Tomato News, 2010).

The production of tomato pomace is seasonal and linked to the harvest period. Most of the product is available in late warm-season and drying or ensiling is necessary for storage (Weiss et al., 1997). Tomato pomace and other tomato by-products are usually found in the vicinity of tomato processing plants, though dried tomato pomace is also exported.

Processes 

Tomato pomace and skins are high-moisture products (often more than 80 % moisture and up to 98 %; NRC, 1983) and spoil very quickly, in less than 2 days in some cases (Caluya, 2000). Unless they can be fed immediately to livestock, they must be preserved either by drying or by ensiling.

Drying

Due to the high moisture content, artificial drying can be expensive and sun drying is preferable. The product should be dried until it is crispy. Once dried, tomato pomace should be ground and the dried product should be mixed thoroughly with the diet (Caluya et al., 2003)

Silage

Tomato processing by-products should not be ensiled alone. Their water content generates large quantities of effluents (Barroso et al., 2005) and pH does not decrease sufficiently for a good preservation (Hadjipanayiotou, 1994). Consequently, it is recommended to add a dry material such as straw to absorb part of the juice (Barroso et al., 2005). When fresh tomato pulp (15.5 % DM) is mixed with 5 or 10 % wheat straw on a fresh basis, final silage (after 90 day) is well preserved and fermented (Ziaei et al., 2010). In the Phillipines, Caluya et al., 2003 recommend to mix the fresh tomato pomace with chopped wilted grasses or roughage such as rice straw or maize stover in plastic containers, or, alternatively, to pack the materials layer by layer (pomace then chopped grasses and so on). The mixture should be approximately 69% pomace and 31% dry grass and the silage is ready after 14 days.

Environmental impact 

Waste reduction

Fresh tomato by-products have been considered an environmental nuisance for a long time (Rabak, 1917). In some countries, the waste is dumped in water bodies near the factory or left to accumulate on the site or production. The material spoils quickly, emits a very foul odor and provides a breeding place for a variety of pests such as flies and mosquitoes, which are hosts of disease-causing organisms (Caluya et al., 2003). Feeding animals with tomato by-products is therefore a valuable way to prevent environmental contamination (del Valle et al., 2006; Caluya et al., 2003).

GM tomatoes

Genetically modified tomatoes containing a gene preventing the accumulation of polygalacturonase, an enzyme involved in the ripening process, were released in the mid-1990s, first as fresh fruits and then as tomato paste. These products were eventually commercial failures and, after an initial success, the GM tomato paste was pulled from the market in 1999. In 2011, no GM tomatoes were commercially available (Bruening et al., 2000; GMO Compass, 2006).

Nutritional aspects
Nutritional attributes 

Tomato by-products are highly heterogenous products. Their physical form, chemical composition and subsquent nutritional value depend on the relative proportions of peels, seeds and other remaining materials left by the various steps of the process, which themselves depend on the target tomato product. For instance, the crude protein and fat content of tomato pomace varies with the amount of seeds, which are richer in protein and fat than the peels (Denek et al., 2006). Tomato processing technologies and tomato products are also continuously evolving to meet market demands (Gasa et al., 1991; Knoblich et al., 2005; del Valle et al., 2006). The common names of the product (pomace, pulp, skins, seeds, waste etc.) may be misleading and only a chemical analysis of the main nutrients (at least protein, fat and fibre) can give a proper idea of the nutritional value of a given batch.

Tomato pomace

Tomato pomace is relatively rich in protein (17-22 % DM) and fat (10-15 % DM) (Feedipedia, 2011). Fat content can even exceed 20 % if the seed proportion is high (Battaglini et al., 1978). Fibre content is high: crude fibre is in the 33-57 % DM range. NDF (50-72 % DM) consists largely of ADF (39-60 %) (Feedipedia, 2011). Lignin content (ADL 20-30 % DM; Feedipedia, 2011) is extremely important though some tomato pomaces contain less than 7 % DM of ADL have been described (Gasa et al., 1989; Fondevila et al., 1994).

Tomato skins

Tomato skins have a lower protein and fat content, and a higher fibre content than pomace (Battaglini et al., 1978; Knoblich et al., 2005). When NaOH is added to improve the efficiency of the mechanical peeling process, tomato skins have a very high Na content (up to > 8 % DM), which may limit the use of tomato skins in animal feeding. In any case, this high Na content has to be taken into account in feed formulation. However, it is possible that this NaOH treatment improves the nutritional value of tomato skins (Cotte, 2000).

Tomato skins also contain appreciable amounts of carotenoids (about 500 mg/kg DM) mostly in the form of lycopene (Knoblich et al., 2005).

Tomato seeds

Tomato seeds have a high protein (25-28 % DM), fibre (54 % ADF) and fat (20-24 % DM) content (El Boushy et al., 2000; Persia et al., 2003). A tomato seed by-product containing a lower amount of fat is either misnamed or is actually a defatted seed meal or cake.

Potential constraints 

Tannins

Tomato pomace and skins contain tannins, which may limit their use in monogastrics (Kavitha et al., 2005).

Tomatine

Unripe tomatoes and the green parts of ripe tomatoes contain a solanine-like alkaloid (saponin) called tomatine that may be toxic to insects but also to dogs and to a lesser extent to herbivores, causing diarrhoea, vomiting and intestinal irritation. However, tomatine disappears as the tomato ripens and is not a problem in tomato pomace (Milner et al., 2011; Straney, 1998). Tomatine may have medicinal properties such as antibiotic, anticancer, anticholesterol, anti-inflammatory, antinociceptive, and antipyretic effects (Milner et al., 2011).

Pesticide residues

Tomato by-products may be contaminated with chemicals such as insecticides, weed killer, etc. (Campos et al., 2005). Skins are directly exposed to these chemicals and pomace is thus prone to contamination. Maximum residue limits for food and feed are fully described in the Codex Alimentarius (Codex Alimentarius, 2011).

Ruminants 

Tomato by-products are usually fed to ruminants due to their high fibre content. They are not excellent feed ingredients, being less digestible than most major oil meal and protein sources. They can be bitter and should then be used together with more palatable feeds. However, they can be a valuable source of protein, energy and fibre and cost-effective (Göhl, 1982; Caluya et al., 2003). In the Phillipines, Caluya et al., 2003 recommend to include tomato pomace at up to 50 % of the daily roughage requirement irrespective of whether it is fresh, dry or ensiled. The pomace should be given before the roughage or mixed (particularly when dry) thoroughly with the chopped roughage.

Digestibility and energy values

In vivo OM digestibility of dried tomato pomace was estimated at 56 % in sheep, using a balanced diet containing 34 % of pomace. In sacco rumen DM degradability was 48% (Abbeddou et al., 2011). A close value of 62 % for OM digestibility was obtained using the gas test method. Extremely wide estimates of ME have been obtained: depending on the method (in vitro, in sacco) and equation used, ME values of 4.9 (Chumpawadee et al., 2007), 7 to 9 (Gasa et al., 1991; Abbeddou et al., 2011) and 11.8 MJ/kg DM (Aghajanzadeh-Golshani et al., 2010) have been proposed.

Protein value

In sacco protein degradability of dried tomato pomace in the rumen is quite high, from 65-70 % (Chumpawadee, 2009; Abbeddou et al., 2011) to 76-78 % (Ben Salem et al., 2008; Valizadeh et al., 2009). However, most of the protein is not digestible in the rumen but in the intestine (Gasa et al., 1988; Gasa et al., 1991, Ventura et al., 2009) probably because an important fraction this crude protein is acid-detergent insoluble (Weiss et al., 1997; Ventura et al., 2009).

Fresh or ensiled tomato pomace

Dairy cows

Tomato pomace ensiled with whole maize plant up to 12 % (DM basis) showed good preservation characteristics. Dairy cows fed with this silage had the same DM intake (3.74 % BW) than cows fed with maize silage alone and had the same milk yield (35 kg/d) and milk composition (Weiss et al., 1997).

Sheep

In lambs, fresh tomato pomace could replace more than 75 % of poor quality hay (6 % protein and 43 % OM digestibility), resulting in higher OM intake and OM digestibility (Ojeda et al., 2001).

Fresh tomato pomace ensiled with 10 % straw (Denek et al., 2006) or 15 % straw (Barroso et al., 2008) on DM basis, is well preserved. When offered as sole forage to 43 kg Awassi rams (Denek et al., 2006) or 47 kg Segureña ewes (Barroso et al., 2008) at maintenance level, DM intake was 0.95 kg/d (Denek et al., 2006) and 1.7 kg/d (Barroso et al., 2008) with a little daily weight gain of 50 g/d (Barroso et al., 2008). It can be concluded fresh tomato pomace ensiled with straw can be good quality roughage for sheep, particularly during periods of forage scarcity (Denek et al., 2006).

Ensiled tomato pomace (20 % DM) can be included in castrated lambs (43.5 kg) diets up to 45 % (diet DM) and replace maize silage without modifying total DM intake (91.7 g/kg0.75). However, OM digestibility of the diet significantly increased up to 30 % replacement but not beyond (Campos et al., 2007).

Dried tomato pomace

Dairy cows

In dairy cows in early lactation (41 kg milk/d) dried tomato pomace included at 10 % (diet DM) did not change DM intake, milk yield and milk composition (Safari et al., 2007). In multiparous dairy cows (26 kg milk/d) dried tomato pomace could be included up to 32.5 % (concentrate diet DM), replacing part of barley grain and whole cottonseed meal without any adverse effect on health, milk yield and DM intake (Belibasakis, 1990).

Beef cattle and growing cattle

In beef heifers, dried tomato pomace could replace completely urea-treated straw, improving rumen digestion and feed efficiency. Diet DM intake increased from 66 (straw only) to 121 g DM/kg BW0.75 (70 % pomace) and decreased slightly (97 g DM/kg BW0.75) when pomace was fed alone (Yuangklang et al., 2006).

In Brahman-Thai steers (188 kg), dried tomato pomace could be included at 50 % (diet DM) in a total mixed ration without any problem. Diet DM intake (103 g/kg BW0.75) was comparable to that obtained with other by-products (brewers grains, palm kernel meal and soybean meal) included at the same amount in the diet (Chumpawadee et al., 2009).

In adult steers (370 kg) fed 21 days a total mixed ration where dried tomato pomace replaced cassava chips (up to 11 % of diet DM), there were no significant changes in DM intake and nutrient digestibilities (OM, protein and fibre) (Yuangklang et al., 2010a). In 2-year Brahman steers (258 kg) for 120 days, the replacement of cassava by tomato pomace tended to reduce daily weight gain (from 1037 to 881 g/d) but differences were not significant (Yuangklang et al., 2010b).

Sheep

In adult rams, a diet containing dried tomato pomace and alfalfa hay in 1:1 ratio resulted in DM, OM and crude protein digestibilities of 57, 59 and 57 % respectively. Yeast addition (4 g/d) significantly increased digestibility up to 68, 67 and 66 % respectively (Paryad et al., 2009).

In growing lambs (18 kg), an experiment compared ad libitum straw-based diets supplemented with 500 g concentrate or with 250 or 125 g concentrate and a feed block containing wheat bran, salt, minerals and 48 % (DM) of dried tomato pulp. DM intake of the feed block + 125 g concentrate was higher. The DM intake of MNB increased (37.5 to 48.7 g/kg W0.75) when the DM intake of offered concentrate decreased (23.1 to 11.9 g/kg W0.75). Growth with the feed block was not significantly different from that of lambs fed straw and concentrate. Growth tended to decrease (57 to 48.7 g/d) when the concentrate offered decreased (Ben Salem et al., 2008).

In fattening lambs fed an alfalfa hay-based diet, dried tomato pomace included at up to 75 % decreased OM digestibility from 66 % to 57 % respectively. Daily weight gain was highest (132 g/d) at a 50 % inclusion rate, which was therefore the maximum recommended rate (Ibrahem et al., 1983). Young growing lambs (15.6 kg) fed for 6 weeks a barley-based diet with 200 g/kg DM of dried tomato pomace had similar N retention and growth performance (304 vs 337 g/d) than lambs fed a diet containing the same level of protein from soybean meal (Fondevila et al., 1994). In growing sheep (6-7 months, 32.6 kg), dried tomato pomace replacing 50 or 75 % of sunflower meal protein significantly decreased DM, crude protein and crude fibre digestibility and it was concluded that 12.5 % was the maximum replacement rate of dietary protein (Mohamed et al., 1997).

Goats

In goats goat fed 21 days with Napier grass ad libitum, dried tomato pomace could replace 25 to 100 % of soybean meal offered at 1.5 % BW without changing forage intake (0.535 kg DM/d), concentrate intake and N utilization (Yuangklang et al., 2007).

Pigs 

While tomato wastes have been described as potentially useful for non-ruminants (Gupta, 1988), there is scarce information concerning the use of tomato pomace, skins and seeds in pig feeding.

Fresh tomato pomace

In the Phillipines, fresh tomato pomace was found to have potential as a supplement feed for grower and finisher pigs. Feeding growing pigs with 6 % fresh tomato pomace significantly increased feed consumption over those fed with a commercial mash and reduced feed cost per kg gain. Feeding of 35 % fresh pomace in the finishing pigs resulted in the significantly higher final weight, total gain in weight, average daily gain in weight and feed consumption. Feed efficiency was comparable to those fed with the commercial mash and feed cost per kg gain was significantly decreased with increasing levels of fresh tomato pomace (Caluya et al., 2000).

Dried tomato pomace

In growing pigs fed isonitrogenous diets containing 4 and 8 % dry tomato pulp with or without enzymes, nutrient digestibility (DM, OM, protein and crude fibre) was significantly reduced at 8 % inclusion rate compared with 4%. Adding of a mixed enzyme preparation (amylase, protease, cellulase) to the rations containing 8 % tomato pulp resulted in increasing DM and crude fibre digestibility to the levels of 4 % tomato pulp, but not the OM and protein digestibility (Imamidou et al., 1999).

In growing and fattening pigs maize-based diets, the simultaneous inclusion of by-products of tomato, grape and pepper (2 % inclusion rate each, replacing about 10 % of the maize grain of the control diet) did not have any negative effects on performance and health (Cilev et al., 2007).

Poultry 

Dried tomato pomace

Dried tomato pomace can be used in poultry feeds, but its high fibre limits the metabolizable energy (ME) content to 8.4-9.5 MJ/kg (Kavitha et al., 2005; Lira et al., 2011) and thus its practical use in poultry feed formulation.

Broilers

Inclusion of dried tomato pomace in broiler diets is possible if taking into account its low energy value in feed formulation. A lower feed intake has been sometimes observed in young animals, which is probably due more to the higher fibre content than to a low palatability, since older animals can consume diets with high pomace levels (Lira et al., 2010). However, growth performance and feed efficiency seem to be sometimes depressed even at low inclusion rates (3% in starters to 9% in finishers; Tabeidian et al., 2011). Increasing inclusion rates from 5 to 20 % decreased performance linearly with a relatively small (6 %) overall decrease in body weight at 20 % inclusion rate. Young animals were more affected and birds older than 28 days did no show a lower growth when 20 % pomace was included in the diet (Lira et al., 2010).

Carcass characteristics do not seem to be negatively influenced by dried tomato pomace (Lira et al., 2010). The lycopene content could even be an advantage, especially in hot climates due to its antioxidant properties (in the quail : Sahin et al., 2008).

Several treatments have been proposed in order to improve the nutritive value of dried tomato pomace in poultry. No significant differences were found between heat treatments (hot air at 121°C vs sun drying) and soaking in alkali, though for all treatments a 10 % inclusion rate of pomace increased performance (Al-Betawi, 2005). An enzyme treatment (enzyme cocktail) failed to improve broiler performance (Tabeidian et al., 2011).

In conclusion, for optimal performance dried tomato pomace should be avoided in very young animals. It can be recommended to include it up to 5-8 % in growers and up to 10-12 % in finishers. Inclusion rates as high as 20 % can be used after 4 weeks of age if the feed is well balanced in energy, but growth and feed efficiency could be reduced. For slow growing chickens, dried tomato pomace can be an interesting option.

Layers

Dried tomato pomace was included successfully in layers diets, which require a lower energy concentration than broilers (Dotas et al., 1999). It can be used as a substitute for wheat bran, which has a similar energy content (Mansoori et al., 2008). At inclusion rates below 10 %, no effect on performance was recorded, while higher levels sometimes depress hen-day production (Jafari et al., 2006). However, in some experiments, levels of 16 % to 20 % pomace were tested without effect on egg production and body weight (Yannakopoulos et al., 1992; Calislar et al., 2010).

No major effect was found on egg weight, structural characteristics (Calislar et al., 2010; Dotas et al., 1999) and overall quality (Nobakht et al., 2007). Thanks to the pigment content of dried tomato pomace (lycopene, carotenoids), egg yolk color was enhanced by its inclusion in diets (Calislar et al., 2010; Dotas et al., 1999). Tomato extract could replace alfalfa extract for pigmentation of eggs (Karadas et al., 2006).

Dried tomato seeds

Dried tomato seeds have a much higher energy level than dried tomato pomace (> 12.6 MJ/kg DM) due to their high fat content. Tomato seeds tested in the diets of chicks (8-21 days of age) resulted in similar performance as control up to 15 % but in a slightly lower growth at 20 % (Persia et al., 2003).

Rabbits 

Dried tomato pomace

Dried tomato pomace an valuable ingredient for rabbits feeding because it is one of few products that are simultaneously rich in digestible energy (13.7 MJ/kg ; Gippert et al., 1988a), mainly as a consequence of the high lipid content, rich in digestible protein (71-74 % digestibility; Battaglini et al., 1978; Gippert et al., 1988a) and also rich in fibre and particularly in lignin, which is important fibre component necessary to control digestive diseases in the rabbit (Gidenne et al., 2010).

For the rabbit, the protein of tomato by-products is rich in lysine (about 7.7 g/16 g N, for a recommendation at 4.5), well-balanced in total sulphur amino acids (4.1 g/16 g N for a recommendation at 3.75) but deficient in threonine (Gippert et al., 1988a).

For growing rabbits, dried tomato pomace can be introduced in the diet up to 20 % without any problem (Gippert et al., 1988b, Rojas et al., 1989; Sayed et al., 2009). Depending on local conditions, it could replace alfalfa (Alicata et al., 1988) or maize grain in the diet (El-Razik, 1996). In a properly formulated diet, the inclusion rate of dried tomato pomace could be increased up to 24-30 % without significantly degrading performance (Gippert et al., 1988b; Waheed, 2005; Sayed et al., 2009).

The lipids of dried tomato pomace are rich in C18:2 (56.9 % of fatty acids) but poor in C18:3 (2.3%). As a consequence, the fat of rabbits fed a diet containing tomato pomace, had a higher proportion of C18:2 n-6 and a lower proportion of C18:3 n-3 than the fat of rabbits fed an alfalfa-based diet (Alicata et al., 1988).

Dried tomato pomace could also be used for rabbit reproduction feeds. For example, a diet containing 20 % dried tomato pomace replacing dehydrated alfalfa could be fed to breeding does for 8 months without any problem (Alicata et al., 1988).

Tomato skins

Dried tomato skins obtained from canneries could be used in growing rabbits up to 20 %, but it should be noted that OM and protein digestibility were low, 36.9% and 51.4% respectively (Battaglini et al., 1978).

Other species 

Dried pomace is sometimes used in pet food and for fur-bearing animals. Tomato pomace has been used in dog foods and fox and mink diets (dry pomace at 5 percent of wet ration) to prevent diarrhea (NRC, 1983).

Nutritional tables
Tables of chemical composition and nutritional value 

Avg: average or predicted value; SD: standard deviation; Min: minimum value; Max: maximum value; Nb: number of values (samples) used

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 93.5 1.5 90.4 95.2 8
Crude protein % DM 21.0 4.2 17.3 35.0 16
Crude fibre % DM 39.0 7.7 27.6 56.9 14
NDF % DM 54.9 6.9 43.2 71.6 12
ADF % DM 44.3 6.6 36.6 60.4 12
Lignin % DM 25.4 5.2 20.6 40.5 12
Ether extract % DM 11.9 4.0 8.9 22.0 9
Ether extract, HCl hydrolysis % DM 13.3 2.6 10.0 17.3 6
Ash % DM 5.2 1.7 3.4 8.4 15
Total sugars % DM 0.0 1
Gross energy MJ/kg DM 21.8 *
 
Minerals Unit Avg SD Min Max Nb
Calcium g/kg DM 4.4 3.9 1.8 10.1 4
Phosphorus g/kg DM 3.6 0.7 2.6 4.1 4
Potassium g/kg DM 8.7 7.1 10.2 2
Sodium g/kg DM 2.4 1
Magnesium g/kg DM 2.2 1.8 2.5 2
Manganese mg/kg DM 72 1
Copper mg/kg DM 11 1
Iron mg/kg DM 227 1
 
Amino acids Unit Avg SD Min Max Nb
Arginine % protein 11.5 1
Cystine % protein 2.0 1
Glycine % protein 5.3 1
Histidine % protein 3.9 1
Isoleucine % protein 4.1 1
Leucine % protein 7.1 1
Lysine % protein 8.0 1
Methionine % protein 2.3 1
Phenylalanine % protein 5.8 1
Threonine % protein 3.3 1
Tyrosine % protein 5.5 1
Valine % protein 4.4 1
 
Secondary metabolites Unit Avg SD Min Max Nb
Tannins (eq. tannic acid) g/kg DM 4.0 1
Tannins, condensed (eq. catechin) g/kg DM 0.0 1
 
Ruminant nutritive values Unit Avg SD Min Max Nb
OM digestibility, ruminants % 55.1 2.7 52.4 57.9 3
OM digestibility, ruminants (gas production) % 33 1
Energy digestibility, ruminants % 55.1 *
DE ruminants MJ/kg DM 12.0 *
ME ruminants MJ/kg DM 9.3 *
ME ruminants (gas production) MJ/kg DM 4.9 1
Nitrogen digestibility, ruminants % 65.4 5.1 61.1 71.1 3
a (N) % 42.4 1
b (N) % 38.8 1
c (N) h-1 0.092 1
Nitrogen degradability (effective, k=4%) % 69 *
Nitrogen degradability (effective, k=6%) % 66 4 59 66 3 *
 
Pig nutritive values Unit Avg SD Min Max Nb
Energy digestibility, growing pig % 35.1 *
DE growing pig MJ/kg DM 7.6 *
MEn growing pig MJ/kg DM 6.8 *
NE growing pig MJ/kg DM 3.9 *

The asterisk * indicates that the average value was obtained by an equation.

References

Abbeddou et al., 2011; AFZ, 2011; Alibes et al., 1990; Aufrère et al., 1988; Chapoutot et al., 1990; Chumpawadee et al., 2007; Gippert et al., 1988; Krishna, 1985; Martinez-Teruel et al., 1982; Nengas et al., 1995; Richard et al., 1989; Woodman, 1945

Last updated on 13/02/2014 15:25:29

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 92.7 1
Crude protein % DM 19.8 1
Crude fibre % DM 37.8 1
Ash % DM 3.3 1
 
Ruminant nutritive values Unit Avg SD Min Max Nb
OM digestibility, Ruminant % 53.7 1
Nitrogen digestibility, ruminants % 61.1 1
 
Pig nutritive values Unit Avg SD Min Max Nb
Energy digestibility, growing pig % 30.8 *

The asterisk * indicates that the average value was obtained by an equation.

References

Alibes et al., 1990

Last updated on 24/10/2012 00:45:45

References
References 
Datasheet citation 

Heuzé V., Tran G., Bastianelli D., Lebas F., Hassoun P., 2015. Tomato pomace, tomato skins and tomato seeds. Feedipedia, a programme by INRA, CIRAD, AFZ and FAO. http://www.feedipedia.org/node/689 Last updated on May 11, 2015, 15:45

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