PMID: 9178135May 1, 1997Paper

Influence of undergradability of protein in the diet on intake, daily gain, feed efficiency, and body composition of Holstein heifers

Journal of Dairy Science
D J TomlinsonM L McGilliard

Abstract

Thirty-two Holstein heifers with body weights (BW) between 213 and 231 kg were randomly assigned to one of four treatments for the 50-d trial. Treatments consisted of four percentages of rumen-undegradable protein (RUP) (31, 43, 50, and 55% of total N) at 100% of National Research Council recommendations for total digestible nutrients and crude protein. Total mixed diets composed of corn silage, ground barley straw, soybean meal, blood meal, urea, and minerals were formulated for a mean daily BW gain of 0.60 kg. Ration RUP percentage was varied by shifting protein sources. Mean dry matter intake (grams per kilogram of BW0.75) was 97.6, 84.4, 77.8, and 73.5 for 31% RUP (soybean meal), 43% RUP (blood and soybean meal), 50% RUP (blood meal with urea), and 55% RUP (blood meal) treatments, respectively. Daily gain was 0.84, 0.89, 0.91, and 0.96 kg/d, respectively. Intake of digestible energy (megacalories per kilogram of BW0.75 per day) was 0.28, 0.24, 0.22, and 0.21, respectively, and feed efficiency (megacalories of digestible energy per kilogram of BW gain) was 20.6, 16.1, 15.2, and 13.3, respectively. Dry matter intake (grams per kilogram of BW0.75), digestible energy intake, feed efficiency, daily BW gain, and hip height differ...Continue Reading

References

Mar 1, 1978·Journal of Animal Science·C R Richardson, E E Hatfield
Nov 1, 1990·Journal of Dairy Science·A C HammondT S Rumsey
Mar 1, 1987·Journal of Dairy Science·A J Heinrichs, G L Hargrove
Jun 1, 1985·Journal of Dairy Science·E Zerbini, C E Polan
Nov 1, 1985·Journal of Dairy Science·J G BaggJ B Stone
Sep 1, 1973·Proceedings of the Society for Experimental Biology and Medicine·R L Preston, S W Kock

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Citations

Oct 1, 2013·Tropical Animal Health and Production·Abdelfattah Z M SalemJavier Arece
Apr 15, 2005·Journal of Dairy Science·J C Marini, M E Van Amburgh

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