© 2019 Elsevier B.V. The objective of the study was to evaluate the effects of feeding varying levels of sun–dried red grape pomace (DGP; Vitis vinifera L. cultivar Pinotage) on nutrient digestibility, rumen fermentation, microbial nitrogen (N) supply, N retention and efficiency of N utilization in lambs. Twenty-one Dohne Merino wether lambs (6.0 ± 1.0 months and 51.6 ± 4.70 kg initial body weight) were randomly assigned to three diets containing 0, 100 and 200 g DGP per kg of diet dry matter in pelleted total mixed rations (TMR). The experiment consisted of 14 days for adaptation to the diets and 7 days for data collection. Intake of neutral detergent fiber (aNDFom) and starch decreased linearly (P ≤ 0.05) while ether extract intake increased linearly (P ≤ 0.05) with the addition of DGP. Apparent total tract aNDFom digestibility decreased linearly (P ≤ 0.05) with increasing levels of DGP. Total volatile fatty acids (VFA) production was quadratically (P ≤ 0.05) influenced by DGP addition. Increasing levels of DGP led to a linear decrease (P ≤ 0.05) in concentrations of butyrate and valerate. Allantoin, microbial N supply, total purine derivatives excreted linearly declined (P ≤ 0.05) with DGP addition. Nitrogen retention and the efficiency of N utilization were not influenced by diet (P > 0.05). Overall, addition of DGP in the lamb finisher diets reduced carbohydrate intake, microbial N yield, total purine derivatives excreted and increased total VFA concentration but did not have adverse effect of DGP on N retention and the efficiency of N utilization.
Effect of grape (Vitis vinifera L. cv. Pinotage) pomace supplementation on nutrient utilization in finisher lambs
Raffrenato E;
2019
Abstract
© 2019 Elsevier B.V. The objective of the study was to evaluate the effects of feeding varying levels of sun–dried red grape pomace (DGP; Vitis vinifera L. cultivar Pinotage) on nutrient digestibility, rumen fermentation, microbial nitrogen (N) supply, N retention and efficiency of N utilization in lambs. Twenty-one Dohne Merino wether lambs (6.0 ± 1.0 months and 51.6 ± 4.70 kg initial body weight) were randomly assigned to three diets containing 0, 100 and 200 g DGP per kg of diet dry matter in pelleted total mixed rations (TMR). The experiment consisted of 14 days for adaptation to the diets and 7 days for data collection. Intake of neutral detergent fiber (aNDFom) and starch decreased linearly (P ≤ 0.05) while ether extract intake increased linearly (P ≤ 0.05) with the addition of DGP. Apparent total tract aNDFom digestibility decreased linearly (P ≤ 0.05) with increasing levels of DGP. Total volatile fatty acids (VFA) production was quadratically (P ≤ 0.05) influenced by DGP addition. Increasing levels of DGP led to a linear decrease (P ≤ 0.05) in concentrations of butyrate and valerate. Allantoin, microbial N supply, total purine derivatives excreted linearly declined (P ≤ 0.05) with DGP addition. Nitrogen retention and the efficiency of N utilization were not influenced by diet (P > 0.05). Overall, addition of DGP in the lamb finisher diets reduced carbohydrate intake, microbial N yield, total purine derivatives excreted and increased total VFA concentration but did not have adverse effect of DGP on N retention and the efficiency of N utilization.
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