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The Effect of Protected Amino Acid Supplementation on the Performance of Dairy Cows Receiving Grass Silage Plus Soyabean Meal

Published online by Cambridge University Press:  21 November 2017

J.C. Robert ,
B.K. Sloan  and
C. Denis
J.C. Robert
Affiliation:
Rhône-Poulenc Animal Nutrition, 03600 Commentry, France
B.K. Sloan
Affiliation:
Rhône-Poulenc Animal Nutrition, 03600 Commentry, France
C. Denis
Affiliation:
Rhône-Poulenc Animal Nutrition, 03600 Commentry, France
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Extract

Methionine has been shown to be the first-limiting amino acid for milk protein synthesis in lactating dairy cows fed maize silage-based diets complemented with soyabean meal (Sloan et al., 1992) (Pisulewski et al., 1993). Thus, the aim of this trial was to investigate the hypothesis that methionine was first-limiting or if not at least colimiting with lysine for milk protein synthesis in dairy cows fed grass silage complemented with soyabean meal.

8 muciparous and 4 primiparous dairy cows six weeks into lactation were randomly allocated to three 4x4 Latin squares (cows and heifers separately), each period containing 2 weeks. The four treatments consisted of Tl = Control ; T2 = 3.7 g methionine ; T3 = 7.4 g methionine ; T4 = 7.4 g methionine and 22.2 lysine . All figures relate to estimated intestinally available amino acids, g/day (Smartamine™ technology Rhône-Poulenc Animal Nutrition). The basal ration was a second cut grass silage offered ad libitum plus 0.57 kg of hay plus an average 10.9 kg concentrate.

Type
Milk Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1994 , March 1994 , pp. 40
Copyright
Copyright © The British Society of Animal Production 1994

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References

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