Ruminal degradability of bypass fat and protein of certain commonly used feedstuffs in dairy rations

M  CHANDRASEKHARAIAH; N M  SOREN; S B N RAO

doi:10.56093/ijans.v92i4.124171

Authors

M CHANDRASEKHARAIAH ICAR-National Institute of Animal Nutrition and Physiology, Adugodi, Bengaluru, Karnataka 560 030 India
N M SOREN ICAR-National Institute of Animal Nutrition and Physiology, Adugodi, Bengaluru, Karnataka 560 030 India
S B N RAO ICAR-National Institute of Animal Nutrition and Physiology, Adugodi, Bengaluru, Karnataka 560 030 India

https://doi.org/10.56093/ijans.v92i4.124171

Keywords:

Bypass fat, Energy supplements, Protein and fat degradability, Protein supplements

Abstract

Studies were conducted to determine the rumen degradability of protein of certain commonly used feed ingredients and degradability of bypass fat used in dairy rations. In situ crude protein (CP) disappearance of groundnut cake, soybean extraction, cottonseed cake, maize gluten meal, wheat bran, rice bran, maize, 0.3, 0.6 and 0.9% (of CP) formaldehyde treated soybean extraction, and in situ fat disappearance of bypass fat in the rumen at different incubation periods were determined by nylon bag technique using 3 adult crossbred steers. The effective degradability was calculated for an assumed outflow rate of 5%/h. The effective CP degradability of groundnut cake, soybean extraction, cottonseed cake, maize gluten meal, wheat bran, rice bran, maize, 0.3, 0.6 and 0. 9% (of
CP) formaldehyde treated soybean extraction was 86, 74, 66, 21, 73, 65, 63, 66, 48 and 26%, respectively. The effective fat degradability of bypass fat was 86%. The results indicated that maize gluten meal is a good source of bypass protein. Soybean extraction although extensively degraded in the rumen, contribute fairly more amount of undegradable protein than rumen degradable protein at an outflow rate of 5%/h, when it is treated with 0.6 and 0.9% (of CP) formaldehyde. The bypass fat supplement prepared from rice bran acid oil is a good source of energy in which about 86% of fat would be available at the lower tract of ruminants. Therefore, maize gluten meal, 0.9% formaldehyde treated soybean extraction and protected fat can be included in the rations of dairy animals for
improved productive performance

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