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KMID : 1025520050470030397
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Journal of Animal Science and Technology
2005 Volume.47 No. 3 p.397 ~ p.408
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Effects of Dietary Supplementation of Feather Meal and It`s Digest on Taurine Content of Cow Milk
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Bae Gui-Seck
Kim H.-S.
Paik In-Kee
Chang Moon-Baek
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Abstract
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This study, consisting of three experiments, was conducted to determine the effects of feeding feather meal (FM), feather meal digest(FMD), L‐cystine and methionine hydroxyl analogue (MHA) on taurine content of milk and milk production of Holstein dairy cows. In experiment 1, FM or FMD was supplemented at 0, 1, 3 and 5% of dry matter intake(DMI), respectively. Taurine concentration of 3% FM and 5% FMD treatment were increased by 14% and 22%, respectively. The 5% FM treatment had a negative effect on milk yield and FM and FMD treatments had no significant or consistent effects on milk fat, protein, lactose, milk urea nitrogen (MUN) and somatic cell count (SCC). In experiment 2, L‐cystine or MHA was supplemented at 0, 1, 3, and 5g or ml/d along with 5% FMD, respectively. Milk yield decreased at 3 and 5g or ml L‐cystine or MHA supplementation along with 5% FMD. Fat and lactose in milk were not significantly affected by treatments. However, milk protein level increased significantly in the 5ml HMA with 5% FMD treatment. SCC decreased significantly in 1ml MHA with 5% FMD supplemented treatment but increased in 5g L‐cystine with 5% FMD and 5ml MHA with 5% FMD treatments. Increase of milk taurine concentration of L‐cystine with 5% FMD treatments was not significant but those of MHA with 5% FMD treatments were significantly higher than the control. The highest increase of milk taurine concentration was 65% shown in 1ml MHA with 5% FMD treatment. In experiment 3, 5% FM, 5% FM+3% molasses or 5% FM+3% molasses+1ml MHA was supplemented to the based TMR diet. The molasses treatments(5% FM+3% molasses and 5% FM+3% molasses+1ml MHA) showed significantly higher milk taurine content than the 5% FM treatment. The molasses treatments significantly reduced MUN but increased SCC. It was concluded that FMD is more effective than FM in enriching taurine in milk. Maximum taurine enrichment (65%) in the milk was obtained by supplementation of 5% FMD/DMI+1ml MHA/d/cow. Molasses supplementation to 5% FM diet increased milk taurine content. However, MHA supplementation in dairy cows increased ruminal escape, gastrointestinal absorption and response of serum methionine.
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KEYWORD
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Feather meal, Feather meal digest, MHA, Molasses, Taurine, Milk composition, Dairy cows
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