The present study was divided into two main experiments: (i) experiment 1 included the
evaluation of apparent nutrient digestibility, pH and ruminal ammonia concentration, and
(ii) experiment 2 investigated the nutrient intake, growth performance and meat quality
of lambs fed diets containing replacement levels (0, 33, 67 and 100% in dry matter basis) of
soybean meal by inactive dry yeast (IDY). experiment 1 used four rumen-fistulated entire
male Santa Ines lambs distributed in a 4
×
4 Latin square. experiment 2 used 36 entire male
Santa Ines lambs in a randomized block design with four treatments and nine replicates. A
quadratic effect (P < 0.05) of IDY was observed on the apparent digestibility of dry matter,
organic matter, crude protein, ether extract and neutral detergent fiber corrected for ash
and protein. A quadratic effect of the diet and sampling time was observed (P < 0.05) on
the concentration of ammonia nitrogen in the rumen. The sampling time (P < 0.05) affected
the ruminal pH with the data adjusted to a quadratic model. Growth performance was not
affected by IDY in the diets. The subcutaneous fat thickness decreased linearly (P < 0.05)
with increased levels of IDY in the diet. The meat crude protein and ash concentration
increased linearly (P < 0.05), and the intramuscular fat concentration decreased linearly
(P < 0.05) with increased levels of IDY in the diet. IDY can replace up to 100% of the soybean
meal in lambs diets, with the use of this by-product depending on economic factors and
market availability.
The present study was divided into two main experiments: (i) experiment 1 included theevaluation of apparent nutrient digestibility, pH and ruminal ammonia concentration, and(ii) experiment 2 investigated the nutrient intake, growth performance and meat qualityof lambs fed diets containing replacement levels (0, 33, 67 and 100% in dry matter basis) ofsoybean meal by inactive dry yeast (IDY). experiment 1 used four rumen-fistulated entiremale Santa Ines lambs distributed in a 4×4 Latin square. experiment 2 used 36 entire maleSanta Ines lambs in a randomized block design with four treatments and nine replicates. Aquadratic effect (P < 0.05) of IDY was observed on the apparent digestibility of dry matter,organic matter, crude protein, ether extract and neutral detergent fiber corrected for ashand protein. A quadratic effect of the diet and sampling time was observed (P < 0.05) onthe concentration of ammonia nitrogen in the rumen. The sampling time (P < 0.05) affectedthe ruminal pH with the data adjusted to a quadratic model. Growth performance was notaffected by IDY in the diets. The subcutaneous fat thickness decreased linearly (P < 0.05)with increased levels of IDY in the diet. The meat crude protein and ash concentrationincreased linearly (P < 0.05), and the intramuscular fat concentration decreased linearly(P < 0.05) with increased levels of IDY in the diet. IDY can replace up to 100% of the soybeanmeal in lambs diets, with the use of this by-product depending on economic factors andmarket availability.
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