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Asian-Australas J Anim Sci > Volume 6(3); 1993 > Article
Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1993;6(3): 395-400.
DOI: https://doi.org/10.5713/ajas.1993.395    Published online September 1, 1993.
Effects of calcium salts of long-chain fatty acids on ruminal digestibility, microbial protein yield and lactation performance
W. J. Maeng, J. H. Lim, S. R. Lee
Abstract
Four sheep per treatment were fed either control or 3% calcium salts of long-chain fatty acids (Ca-LCFA) in a total mixed ration (TMR). Feed and free water intakes were not different, but digestibilities of crude protein and crude fiber were lower (p<0.05) and that of crude fat was higher (p<0.05) for sheep fed Ca-LCFA than for control sheep. Dry matter digestibility, ruminal pH and microbial protein yield were not different between treatments and ammonia-N concentration in the rumen was higher for sheep fed Ca-LCFA than for control sheep. A 60-day milk production trial was conducted with thirty lactation Holstein cows. Fifteen cows per treatment were fed TMR containing either control or 3% Ca-LCFA ad libitum. Feed intake was not different between treatments, but milk yield was significantly higher (p<0.05) for cows fed Ca-LCFA than for control cows. Milk fat percentage was slightly higher and milk protein was lower for cows fed Ca-LCFA than for control cows. Lactose and total solid contents in milk were not different between treatments.
Keywords: Calcium Salts of Long-Chain Fatty Acids; Digestibility; Milk Yield; Milk Composition; Ruminal pH; Ammonia-N


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