Improving the reproductive status of high lactating cows through applying a new nutritional strategy
Abstract: Twenty-eight multiparous Holstein-Friesian high lactating cows in a commercial dairy herd were treated by feeding on two complete diets with two different levels of CP level, high (19.3%) or low (16.9%), with or without pMet supplementation. The reproductive performances and some blood metabolites of these cows were determined. Cows were divided into four comparable and equal groups which received low CP level of 16.9 % diet (Gr.l); low CP level of 16.9 % diet and pMet supplement of 12 g/cow/d (Gr.2); high CP level of 19.3 % diet (Gr.3), and high CP level of 19.3 % diet and pMet supplement of 12 g/cow/d (Gr.4). Milk samples were collected at each milking once every month from all tested cows to determine MUN. Blood samples were taken from three cows of each group at 0, 3, and 6 h. of feeding. The pregnancy rate, measured at the end of the treatment period (after 220 d of calving), ranged from 57 to 71 %; it was significantly reduced by increasing level of the dietary CP. The pMet supplementation showed an improvement in the pregnancy rate particularly at the high level 0f CP. The CFI did not differ among all groups.
The AI/C was not affected by the dietary CP level; however, the elevated dietary CP significantly increased number of insemination within 220d in non-pregnant cows and significantly prolonged days open 17d longer than cows received the low level Plasma total protein, albumin, and globulin were not affected by treatments. The MUN was significantly (P<0.01) increased by increasing dietary CP level throughout the lactation period. The PMet supplementation significantly (P<0.01) decreased MUN concentrations throughout the experimental period. The PUN was significantly (P<0.01) increased by increasing the CP level and time of sampling relative to feeding. The pMet supplementation numerically decreased PUN concentrations. It was concluded that feeding the high lactating cows on diet of not more than 16.9% CP supplemented with pMet is an acceptable new nutritional strategy for improving their reproductive performances.
Key words: Blood Urea Nitrogen (BUN), Crude Protein (CP), Conception Rate (CR), Days from Calving to First Insemination (CFI), Days Open (DO), Milk Urea Nitrogen (MUN), Number of insemination per Conception (AI/C), Protected Methionine (pMet), Pregnancy Rate (PR), Total Mixed Ration (TMR).
Publication year 2005
Pages 67-84
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
Availability number
Organization Name
City بنها
serial title Benha Veterinary Medical Journal
Author(s) from ARC
External authors (outside ARC)
    مصطفى عبد الحليم الحرايرى جامعة المنصورة
    احمد عبد الرازق جبر جامعة المنصورة
    على السيد الغندور السيد شركة المنصورة للتنمية الزراعية
    محمد بدر الدين ابو العلا جامعة المنصورة
Agris Categories Animal physiology - Reproduction
AGROVOC
TERMS		 Crude protein. Pregnancy. Reproductive performance.
Proposed Agrovoc reproductive status;lactating cows;Blood Urea Nitrogen;Days from Calving;First Insemination;Days Open;Milk Urea Nitrogen;Protected Methionine;
Publication Type Journal
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