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Ref #512 : Influence of amount and degradability of protein on production of milk and milk components by lactating Holstein cows
Author(s):
Christensen RA, Lynch GL, Clark JH, Yu Y.
Date:
1993
Reference Type:
Journal
Periodical:
Mitteilungen aus dem Gebiete der Lebensmitteluntersuchung und Hygiene
Issue:
76
Volume:
11
Page range:
3490 - 3496
Keywords:
Acids, Amino-acids, Availability, Body-weight, Cattle, Cows, Diet, Feeding, Intake, Maize, Maize-silage, Milk, Milk fat percentage, Milk-composition, Milk-fat, Milk-yield, Production, Protein, Protein-degradation, Protein-intake, Proteins, Rumen, Silage, Sources, Synthesis, Treatment, Weight.
Abstract / Notes:
41 multiparous cows were utilized in a completely randomized design with a 2 X 2 factorial arrangement of treatments to evaluate the amount and degradability of dietary CP on production of milk and milk components. The total mixed ration contained 25% lucerne haylage, 25% maize silage and 50% concentrate to provide either 16.4 or 19.4% CP with a calculated ruminal degradability of 55 or 70%. Intakes of DM, ADF and NDF and body weight were not different among treatments. Production of milk, 4%-FCM, fat, CP and SNF was not affected by amount or degradability of dietary CP. Milk CP percentage was not affected significantly by amount or degradability of CP. Milk fat percentage was increased by the diet that was high in ruminally undegradable protein (2.90 and 3.12; low and high ruminally undegradable protein respectively). These data suggest that synthesis of milk and milk components was not limited by a shortage of amino acids or that the different dietary sources of supplemented CP did not alter amino acid availability513