EurekaMag.com logo
+ Site Statistics
References:
53,869,633
Abstracts:
29,686,251
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Effect of rumen protein degradability on milk yield of dairy cows in early lactation



Effect of rumen protein degradability on milk yield of dairy cows in early lactation



Journal of Dairy Science 66(9): 1873-1880



Twenty-four mature Holstein cows were fed diets of 40% corn silage and 60% concentrate (dry matter) beginning at parturition through wk 16 of lactation. A control concentrate (corn, soybean meal, and barley) was fed through wk 4 followed by assignment of cows to either a concentrate of low or high rumen protein degradability. In situ trials with two fistulated cows fed similar diets yielded rumen protein degradabilities of 78.5, 70.3, 69.9, 67.3, 49.1, and 36.5% for barley, corn, corn gluten feed, soybean meal, brewer's grains, and cottonseed meal. The low degradability concentrate (corn, cottonseed meal, brewer's grains, and corn gluten feed) had an estimated rumen protein degradation of 52.9% and a total ration crude protein of 14.3%. The high degradability concentrate containing corn, barley, and soybean meal was 72.8% rumen degradable, and total ration protein for this treatment was 14.5%. Dry matter intakes were 21.0 and 22.0 kg/day for the low and high degradability diets. Milk yield, fat percent, and fat-corrected milk were not affected by treatment. Milk protein percent and protein yield decreased from 3.00 to 2.84% and 1.07 to .99 kg/day in the high and low degradability diets. Efficacy of use of degradability as a criterion for feed formulation is questioned until understanding of both feed protein breakdown and microbial synthesis is greater.

(PDF emailed within 0-6 h: $19.90)

Accession: 001189303

Download citation: RISBibTeXText

PMID: 6630671

DOI: 10.3168/jds.S0022-0302(83)82025-6



Related references

Influence of degradability of supplemental protein and time post partum in early lactation dairy cows 1. rumen fermentation and milk production. Livestock Production Science 28(2): 121-138, 1991

Effect of rumen undegradable protein and ration fiber level on milk yield and milk protein content from early lactation dairy cows fed corn silage based diets. Journal of Dairy Science 79(SUPPL 1): 209, 1996

Effect of dietary starch level and high rumen-undegradable protein on endocrine-metabolic status, milk yield, and milk composition in dairy cows during early and late lactation. Journal of Dairy Science 97(12): 7788-7803, 2015

Effect of increased rumen-undegradable protein fed prepartum on milk production and milk protein yield in early lactation for high producing Holstein cows. Journal of Dairy Science 86(Supplement 1): 60, 2003

Influence of degradability of supplemental protein and time post partum in early lactation dairy cows 2. kinetics of rumen ingesta turnover and whole tract digestibility. Livestock Production Science 29(2-3): 167-180, 1991

The effects of protein degradability and food intake on milk yield and composition in cows in early lactation. British Journal of Nutrition 45(3): 547-555, 1981

The effects of feeding protected fat to dairy cows in early lactation on its disappearance rate from the rumen and on milk yield. RDA Journal of Agricultural Science, Livestock 36(1): 479-484, 1994

Studies on ad libitum feeding for dairy cows. III. The effect of the protein content of diets for high-yielding cows in early lactation on intake, milk production, weight change, rumen parameters, and blood plasma characteristics. Research Bulletin of the Aichi ken Agricultural Research Center (16): 317-324, 1984

Effects of dietary crude protein concentration and degradability on milk production responses of early, mid, and late lactation dairy cows. Journal of dairy science 82(3): 545-554, 1999

Effect of ration protein degradability on milk yield of dairy cows. Proceedings of the eighteenth annual Nutrition Conference for Feed Manufacturers April 20 and 21-1982 Toronto Ontario Conference committee JG Buchanan Smith et al, 1982

Effect of dietary protein and degradability on milk yield: early lactation. Journal of Dairy Science 68(Suppl. 1): 113, 1985

The influence of a formulated excess of rumen degradable protein or undegradable protein on milk production in dairy cows in early lactation. Animal Production 46(1): 13-22, 1988

Rumen-protected conjugated linoleic acid supplementation to dairy cows in late pregnancy and early lactation: effects on milk composition, milk yield, blood metabolites and gene expression in liver. Acta Veterinaria Scandinavica 52: 16-16, 2010

Early selection of dairy cows. III. Effect of 1st lactation milk yield and age at 1st calving on total milk yield to 6 yr of age. Pol'nohospodarstvo. 17: 9, 762-770, 1971

The effect of protein degradability on milk composition and production of early lactation, somatotropin-injected cows. Journal of Dairy Science 74(5): 1648-1653, 1991