Sununary: Four Jersey cows wcre used in a 4x4 Latin-square designed tria1. The cxperimental feeding periods were five weeks in length. During the fifth week of each period feed, faces, milk and rumen flııid samples were collected for analysis.Good quality alfalfa hay was used as sole source of roughage. Hayand 5 % urea containing concentrate mixtures were fed in the proportions of 60:40, 50:50; and 40:60.The ratio of hay to concentrate without urea was 50:50. Rations were gi"en three times a day in equal amounts. The quantity of feed fed and refused was recorded daily, and about 200 g of hayand concentrate mixture samples were collected at each feeding during the comparison periods. The faces sampk-s were taken from the rectum twice a day at the same period. The cows were milked at 5 A. M. and 5 P. M. and production was recorded.Milk samples of 50 ml were Collected each day of the comparison periods.Rumen fluid samples were drawn by a stainless stecl rumen suction strainer at 2 and 4 hours after feeding on the last two days of every comparison period. Rumen fluid pH was determined immediately af ter sampling with a glass C1ectrode Beckman pH meter. One ml of saturated mercuric chloride solution was added to i00 ml of rumen fluid and samples were kept at _30°C in a freezer un til VFA determinations were made .• II. Dünya Hayvan Besleme Kongresinde tebliğ edilmiştir. Ekim 1972 Madrid, İs. panya ** Bu araştırma TBTAK tarafından desteklenmiştir (VHAG/88)
Summary:This experiment was condııcted to compare the prohable effect of com silage and straw silage on feed intake, dry matter and food nutrienl~digestibility and milk performancc.Forty-ciı:ht Btown Swiss cows were ;,lIotted into 4 groups. The com silage and hay (Tr. A) was fen to one group at 2:1 ra'-io, s~rond group (Tr. ll) had straw silaı:e ann hayat ıhe same ratio, while ıhe third group (Tr. C) only straw si!age ann the las! group (Tr. D) frcsh mixture of straw, urea, moıasse~and waler, same as in ıhe proportions of the straw silage (37: i: 12 and 50 %1. The experiment;:1 period Jas!ed ıa weeks.The s!raw silage was comumed significantly more (1'<0 OL) ıhan com silage+hay.Prote:n digestibility was found higher (P
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 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.
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