This study was conducted to evaluate the effect of dietary supplementation of acetic acid at different levels on milk yield and composition. A total of eighteen Awassi ewes in the early stage of lactation were used in this study, with average body weight (37.631.84) and ages (3–4 years). Animals were allocated to three treatments; the first treatment was control fed with a basal diet without additives (T1). Acetic acid (98%) was added to the concentrate feed daily before feeding by 5 mL/ewe daily in T2 and 10 mL/ewe in T3 after dilution 1:10 with tab water. Results indicate an insignificant increase in ewes' body weight in T2 and T3, which were 40.41 and 41.11 kg compared to T1 at 37.93 kg. Actual milk yield was not affected while fat corrected milk Increased in T3 was 390 g/day compared to T2 with 323 g/day. Milk fat percentage increased (p ≤ 0.05) in T3 at 6.26% as compared to T1 and T2 at 5.65% and 5.43%, respectively, while fat yield was higher (p ≤ 0.05) in T3 at 23.85 g/day than in T2 17.58 g/day. This was reflected in increased milk energy (p ≤ 0.05) in the T3 at 953 kcal/kg compared to T2 at 858 kcal/kg. From the results, it can be concluded that acetic acid can be used as an additive to the ewes diet, and effect positively in ewes’ weight and milk fat.
Protected amino acids especially methionine and lysine are considered one of the most important additives to the feed of high growth or production animals and the response may depend or affected by the balance between the amino acids and energy requirements. Local Awassi lambs (6 to 9 months of age) in the previous studies showed altered responses to the feeding protected protein. The current study aimed to investigate the effect of protected methionine to the feed of lambs after weaning on growth and carcass traits. Ten Awassi lambs were used in this study ages 4 to 5 months and average body weights 22.81±0.48, lambs were divided into two treatments and fed using ad-libitum system at two meals daily on control diet in the first treatment or with addition 5 g/lamb/day of protected methionine in the second treatment. Our result was showed that feeding Awassi lambs with protected methionine directly after weaning decreased feed intake, final body weight, total gain as compared with control, but carcass traits such as hot carcass weight, dressing percentage, rib-eye muscle area and subcutaneous fat thickness were not affected.
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