Pipat, Lounglawan

Suranaree University of Technology Intellectual Repository

School of Animal Production Technology, Institute of Agricultural Technology, Suranaree University of  Technology, Nakhon Ratchasima, 30000. Tel.: 0-4422-4160; Fax.: 0-4422-4150; E-mail: pipat@g.sut.ac.th* Corresponding authorSuranaree J. Sci. Technol. 14(1):109-117During early lactation, the amount of energyrequired for maintenance of body tissues andmilk production often exceeds the amount ofenergy available from the diet (Goff and Horst,1997), thus forcing mobilization of body fatreserves to satisfy energy requirement. Prilledsaturated fatty acids and calcium (Ca) salts oflong-chain fatty acids have been shown to beeffective as ruminally inert fat supplements forlactating cows (Grummer, 1988; Palmquist,1991). Rumen inert fats, such as Ca salts ofTHE EFFECT OF RUMINAL BYPASS FAT ON MILK YIELDSAND MILK COMPOSITION OF LACTATING DAIRY COWPipat  Lounglawan*, Wisitiporn  Suksombat and Khukhan  ChullanandanaReceived: Jun 8, 2006; Revised: Nov 7, 2006; Accepted: Nov 8, 2006AbstractA study was conducted to determine the effect of feeding rumen-bypass fat on performance of dairycows. Twenty four Holstein Friesian crossbred (>87.5% Holstein Friesian) lactating dairy cows inearly-mid lactation, averaging 23.3 + 3.5 kg of milk, 85 + 5 days in milk, 60.8 + 5.9 months old and464 + 43 kg live weight, were stratified for milk yield, days in milk, age, stage of lactation and bodyweight, and then randomly allocated to two treatment groups. All cows were fed approximately 10 kgof concentrate together with ad libitum grass silage and freely access to clean water. Nil or 300 g ofrumen-bypass fat was supplemented to the cows according to the treatment groups. All cows consumedsimilar amount of concentrate, roughage and total dry matter (DM) and crude protein (CP). There wereno significant differences in milk yields and milk composition yields. All cows had similar fat, protein,lactose, solid not fat and total solid percentage in milk. All cows lost similar live weight. Rumen-bypassfat supplementation significantly (p<0.05) reduced C4:0 but increased C12:0 and C14:0 fatty acids ofthe cows’ milk. The present study indicated that supplementation of rumen-bypass fat did not enhancemilk yields, milk composition and live weight change.Keywords: Rumen-bypass fat, milk production, milk composition, dairy cattleIntroductionlong-chain fatty acids or other forms ofrumen-bypass fat, are often fed to increasethe dietary energy supply. Responses tosupplementation of dairy cow diets withrumen-bypass fat have been variable. Forexample, feeding rumen-bypass fat to dairy cowshas been reported to increase fat-corrected milkyield (Erickson et al., 1992), milk and fat-corrected milk yields (Klusmeyer et al., 1991a;Rodriguez et al., 1997), and milk fat percentage(Klusmeyer et al., 1991a, 1991b; Sklan et al.,

The effect of ruminal bypass fat on milk yields and milk composition of lactating dairy cow

http://sutir.sut.ac.th:8080/jspui/bitstream/123456789/2195/1/1600_abst.pdf

The effect of ruminal bypass fat on milk yields and milk composition of lactating dairy cow

Abstract

Similar works

Full text

Available Versions

Suranaree University of Technology Intellectual Repository