Sumrnary: The effects of low--protcin concentrate and different protein supplement on milk yield, milk composition, digestibilities of ration dry matters protein and cellulose and blood levds of ketoncs and glucose were studied. In this trial4 Jersey lactating cows were us.:d in a 4x4 Latin-square design. A 4-week transition and one week comparison periods followed a 2--month adaptation period. Treatments varied in their protein contents (11-16 %) and source of protein i.e. urea, cottonseed oil

more »

... meal and sunflower oil mea!. Good quality hayand eoncentrates wc re fed ad libitum and according to milk production of the cows (3:1) respeetively to animals. ]'Iio treatment effects were measured on milk produetion, FCM, and milk eomposition. The digestibilikS of dry matter, crude protein and erude fiber were found nonsignificantly higher for the eoncentrate containing sunflmver oil meal than for the other treatments. Protein supplemcntation to the coneentrates slightly improved erude protein and fiber digestibilities. Values for blood ketones and glucose were not significantly different for the treatments. Özet: Bu araştırma, proteini noksan bir konsantre yenılc protein saplementi olarak üre, pamuktohumu ve ayçiçeği küspelerini kapsıyan konsantre yemlerin süt verimi ve kompozisyonuna, kuru madde ve bazı besin maddelerinin sindirilme oranına ,-c kan glükoz ve keton düzeylerine etkisini incelemek amacıyla yapılmıştır.