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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 260 - 271 (12page)
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초록· 키워드
오류제보하기
The objective of this study was to determine the effect of different stocker management programs on skeletal muscle development and growth characteristics, satellite cell (SC) activity in growing-finishing beef cattle as well as the effects of SC-conditioned media on preadipocyte gene expression and differentiation. Fall-weaned Angus steers (n = 76; 258 ± 28 kg) were randomly assigned to 1 of 4 stocker production systems: 1) grazing dormant native range (NR) supplemented with a 40% CP cottonseed meal-based supplement (1.02 kg ∙ steer–1 ∙ d–1) followed by long-season summer grazing (CON, 0.46 kg/d); 2) grazing dormant NR supplemented with a ground corn and soybean meal-based supplement fed at 1% of BW followed by short-season summer grazing (CORN, 0.61 kg/d); 3) grazing winter wheat pasture (WP) at high stocking density (3.21 steers/ha) to achieve a moderate rate of gain (LGWP, 0.83 kg/d); and 4) grazing winter WP at low stocking density (0.99 steers/ha) to achieve a high rate of gain (HGWP, 1.29 kg/d). At the end of the stocker (intermediate harvest, IH) and finishing (final harvest, FH) phases, 4 steers / treatment were harvested and longissimus muscles (LM) sampled for cryohistological immunofluorescence analysis and SC culture assays. At IH, WP steers had greater LM fiber cross-sectional area than NR steers; however, at FH, the opposite was observed (p < 0.0001). At IH, CORN steers had the lowest Myf-5+:Pax7+ SC density (p = 0.020), while LGWP steers had the most Pax7+ SC (p = 0.043). At FH, CON steers had the highest LM capillary density (p = 0.003) and their cultured SC differentiated more readily than all other treatments (p = 0.017). At FH, Pax7 mRNA was more abundant in 14 d-old SC cultures from HGWP cattle (p = 0.03). Preadipocytes exposed to culture media from proliferating SC cultures from WP cattle isolated at FH had more PPARγ (p = 0.037) and less FABP4 (p = 0.030) mRNA expression compared with NR cattle. These data suggest that different stocker management strategies can impact skeletal muscle growth, SC function, and potentially impact marbling development in growing-finishing beef cattle.
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등록된 정보가 없습니다.
참고문헌 (37)
참고문헌 신청
Anderson P. / Optimum forage use in beef cattle growing and finishing diets
Loken BA / 2009 / Growing rate of gain on subsequent feedlot performance, meat, and carcass quality of beef steers / J Anim Sci 87:3791~3797
Hersom MJ / 2004 / Effect of live weight gain of steers during winter grazing: I. feedlot performance, carcass characteristics, and body composition of beef steers / J Anim Sci 82:262~272
Anderson P / 2007 / Non-genetic factors that affect quality grade of fed cattle / Proceedings Beef Improvement Federation 39th Annual Research Symposium and Annual Meeting
Seideman SC / 1986 / The effects of sex condition, genotype and diet on bovine muscle fiber characteristics / Meat Sci 17:55~72
Loken BA / 2009 / Growing rate of gain on subsequent feedlot performance, meat, and carcass quality of beef steers / J Anim Sci 87:3791~3797
Hersom MJ / 2004 / Effect of live weight gain of steers during winter grazing: I. feedlot performance, carcass characteristics, and body composition of beef steers / J Anim Sci 82:262~272
Anderson P / 2007 / Non-genetic factors that affect quality grade of fed cattle / Proceedings Beef Improvement Federation 39th Annual Research Symposium and Annual Meeting
Seideman SC / 1986 / The effects of sex condition, genotype and diet on bovine muscle fiber characteristics / Meat Sci 17:55~72
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