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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 485 - 494 (10page)
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초록· 키워드
오류제보하기
Limiting amino acids (AAs) for milk production in dairy cows fed on a concentrate diet of corn grain and soybean meal was evaluated in this study. Four lactating and multiparous Holstein cows (in third or fourth parities, with an average body weight of 633 ± 49.2 kg), 8 to 9 weeks into their lactation period, were used in a 4 × 4 Latin square design. The experiment comprised four dietary treatments: (1) no intravenous infusion (control); (2) control plus intravenous infusion of an AA mixture of 6 g/d methionine, 19.1 g/d lysine, 13.8 g/d isoleucine, and 15.4 g/d valine (4AA); (3) control plus intravenous infusion of the AA mixture without methionine (no-Met); and (4) control plus intravenous infusion of the AA mixture without lysine (no-Lys). All animals were fed on a controlled diet (1 kg/d alfalfa hay, 10 kg/d silage, 14 kg/d concentrate mixture, ad libitum timothy hay). The AA composition of the diet and blood were determined using an automatic AA analyzer. Milk composition (protein, fat, lactose, urea nitrogen, and somatic cell counts) was determined using a MilkoScan. The results showed that feed intake for milk production did not differ from that of intravenous infusion using a limiting AA mixture. The 4AA treatment numerically had the highest milk yield (32.4 kg/d), although there was no difference when compared with the control (31.2 kg/d), no-Met (31.3 kg/d), and no-Lys (31.7 kg/d) treatments. The concentration of AAs in blood plasma of cows in all treatments, mainly isoleucine and valine, increased significantly compared with that of control. The no-Met treatment increased (p < 0.05) the concentration of lysine in the blood relative to the control and no-Lys treatments, whereas the no-Lys treatment increased (p < 0.05) the concentration of methionine relative to the control and no-Met treatments. In conclusion, milk production increased when feeding 10 g/d methionine to the cows, together with their concentrate diet of corn grain and soybean meal.
목차
등록된 정보가 없습니다.
참고문헌 (43)
참고문헌 신청
Food and Agriculture Organisation of the United Nations / 2006 / Livestock’s long shadow -Environmental issues and options / FAO
Vérité R / 1987 / Révision du systém des protéines digestibles dans l’intesitn(PDI) / Bull Tech CRZV Theix INRA 70:19~34
Rulquin H / 1997 / Effects of the energy balance of dairy cows on lactational responses to rumen-protected methionine / J Dairy Sci 80:2513~2522
Fox DG / 1992 / A net carbohydrate and protein system for evaluating cattle diets: III. cattle requirements and diet adequacy / J Anim Sci 70:3578~3596
Lanzas C / 2007 / A revised CNCPS feed carbohydrate fractionation scheme for formulating rations for ruminants / Anim Feed Sci Technol 136:167~190
Vérité R / 1987 / Révision du systém des protéines digestibles dans l’intesitn(PDI) / Bull Tech CRZV Theix INRA 70:19~34
Rulquin H / 1997 / Effects of the energy balance of dairy cows on lactational responses to rumen-protected methionine / J Dairy Sci 80:2513~2522
Fox DG / 1992 / A net carbohydrate and protein system for evaluating cattle diets: III. cattle requirements and diet adequacy / J Anim Sci 70:3578~3596
Lanzas C / 2007 / A revised CNCPS feed carbohydrate fractionation scheme for formulating rations for ruminants / Anim Feed Sci Technol 136:167~190
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