Nutrient requirements of dairy cattle , Nutrient requirements of dairy cattle , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

Nutrient requirements of dairy cattle

This study investigated the effect of feeding two levels of rumen degradable protein in the rations during different stages of lactation on milk yield and components , twenty four cross breed Awassi ewes (Turkish Awassi × Iraqi Awassi) were used with their single lambs after birth aged 3-5 years, ewes were divided into two groups with average body weights 66.00 ± 2.32 kg and 67.10 ± 2.62 kg respectively, first group was control fed adequate level of degradable protein (10 g / Mj metabolizable energy) and second group fed high level of degradable protein (12.5 g / Mj metablizable energy) , Lactation period had been divided into three stages (early, 1-50 day ), ( mid , 51-100 day) and (late , 101-150 day), ewes were fed twice daily with restricted amount 2 kg in the early and mid and 1.5 kg in late lactation . Results showed that feeding adequate level of rumen degradable protein led to significant ( P< 0.05) increase in milk yield 785 g/day and lactose 5.81% as compared with high level 619 g/day and 5.58% respectively, also milk yield decreased ( P< 0.05) while milk fat increased ( P< 0.05) with advance milk period. Blood parameters were not affected significantly by feeding degradable protein while serum glucose, total protein and albumin decreased (P< 0.05) at late stage of milk production. Best results of interaction for rumen degradable protein and milk stages in milk yield and components yield were noted with feeding adequate level of rumen degradable protein in the early lactation.

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Effect degradable protein level g/mj metabolizable energy through different stages of lactation on milk yield and composition of awassi ewes

Performance of karadi sheep in kurdistan region/iraq: a review

Twenty-four lactating Karadi ewes, 3-5 years old and 54±0.69 kg in body weight were used to study the effect of rumen degradable protein (RDP) to rumen undegradable protein (RUP) ratio on milk yield, composition and some blood metabolites. Ewes with their lambs were placed in individual pens and fed ad libitum on three rations containing different levels of RDP:RUP namely 68:32 (T1), 56:44 (T2) and 50:50 (T3). Milk yield was recorded in two successive days at biweekly intervals commencing at 2 nd week post lambing by using hand milking and lamb suckling technique. Also, blood samples were withdrawn at start, mid and at the end of the experimental period (84 days). Daily milk yield and total milk yield averaged 1.16±0.038 and 98.31±4.44 kg, respectively. Feeding ewes protected soybean meal (SBM) resulted in a nonsignificant increase in milk yield in T3 (15.22%), and 12.06% in fat corrected milk (FCM) in T2 as compared to control. A significant (P<0.05) effect of treatment on both percentage and yield of fat and protein was observed. However, the highest fat percent and yield was recorded in T2, whereas, the highest percent and yield of protein was noticed in T2 and T3, respectively. Cholesterol and urea levels was significantly (P<0.05) lower in T1 as compared to other groups.

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Influence of varying levels of rumen degradable to undegradable protein on milk yield, composition and some blood parameters of karadi ewes

Twenty-four lactating Karadi ewes, 3-5 years old and 54±0.69 kg in body weight were used to study the effect of RDP to RUP ratio on milk yield, composition and some blood attributes. Ewes with their lambs were placed in individual pens and fed concentrate and straw ad lib. Milk yield was recorded in two successive days at biweekly intervals commencing at 2 week post lambing by using hand milking and lamb suckling technique. Also, blood samples were withdrawn at start, mid and at the end of the experimental period (84 days). Daily milk yield and total milk yield averaged 1.16±0.038 and 98.31±4.44 kg, respectively. Feeding ewes protected SBM resulted in a non-significant increase in milk yield in T3 (15.22%), and 12.06% in FCM in T2 as compared to control. A significant (P<0.05) effect of treatment on both percentage and yield of fat and protein was observed. However, the highest fat percent and yield was recorded in T2, whereas, the highest percent and yield of protein was noticed in T2 and T3, respectively. Cholesterol and urea levels was significantly (P<0.05) lower in T1 as compared to other groups.

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Emad Tayar Sadeeq Buti Buti

Papers

Influence of varying levels of rumen degradable to undegradable protein on milk yield, composition and some blood parameters of karadi ewes

Influence of varying rumen degradable to undegradable protein ratios on milk yield, composition and some blood parameters of karadi ewes