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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
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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