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Pakistan Journal of Biological Sciences
  Year: 2008 | Volume: 11 | Issue: 13 | Page No.: 1669-1675
DOI: 10.3923/pjbs.2008.1669.1675
 
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Effects of Monensin and Increasing Crude Protein in Early Lactation on Performance of Dairy Cows

Behnam Ghorbani, Taghi Ghoorchi, Hamid Amanlou and Saeed Zerehdaran

Abstract:
Twenty-four Holstein dairy cows were used to evaluate the singular and combined effects of different level of crude protein and monensin treatments during the early lactation on digestion and milk yield of dairy cows. The experiment was designed as completely randomized with a 3x2 factorial arrangement of treatments. The factors were three Concentrations of CP supplement (19.5, 21.4 and 23.4% of dry matter) and two levels of monensin (0 and 350 mg per cow per day). This experiment consist of three periods and each period was 3 week in length. Monensin did not affect DMI, milk yield, lactose and SNF but it reduced milk fat and protein percentage. Monensin premix significantly decreased rumen ammonia but rumen pH and microbial protein synthesis was not affected by monensin treatment. Although, Monensin treatment increased apparent digestibility of DM, NDF, ADF, CP, but they were not significantly. Increasing dietary CP, improved milk and protein production, but did not alter the other components of milk. Digestibility of NDF, ADF, CP were improved by increasing dietary CP. Increasing diet CP from 19.5 to 21.4% did not significantly increase ruminal ammonia, but increasing to 23.4% have significant effect on it. There was a linear relationship between level of crud protein in the diet and urine volume excretion. Microbial protein synthesis was affected by increasing CP level; on this way maximum protein synthesis was achieved in 21.4% CP.
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How to cite this article:

Behnam Ghorbani, Taghi Ghoorchi, Hamid Amanlou and Saeed Zerehdaran, 2008. Effects of Monensin and Increasing Crude Protein in Early Lactation on Performance of Dairy Cows. Pakistan Journal of Biological Sciences, 11: 1669-1675.

DOI: 10.3923/pjbs.2008.1669.1675

URL: https://scialert.net/abstract/?doi=pjbs.2008.1669.1675

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