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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.1
- 수록면
- 208 - 215 (8page)
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This study was designed to investigate the carryover effects of high-forage to concentrate (F: C) diet in bred heifers on feed intake, feed efficiency (FE) and milk production of primiparous lactating Holstein cows. The experiment was conducted for 589 days (d) from onset of pregnancy through to the end of first lactation. Twenty-four bred heifers (Body weight: $BW=345.8{\pm}45.4kg$ and $15{\pm}1.2mon$ of age) randomly assigned to two groups of 3 pens containing 4 heifers each and fed high forage (HF) diet with F: C ratio of 91.7: 8.3% and low forage (LF) diet with F: C ratio of 77.8: 22.2% throughout the pregnancy period. After calving, lactating cows were fed total mixed ration (TMR) based diet. No differences (p > 0.05) were observed in dry matter intake (DMI) of bred heifers and primiparous lactating cows in both HF and LF groups. The FE of mid-to-late lactation period was higher (p< 0.05) in HF than LF group. However, the HF group showed higher (p < 0.05) milk yield, 4 % fat corrected milk (FCM) and energy corrected milk (ECM) than LF group during the 305 d lactation. The LF group showed higher (p < 0.05) milk fat, crude protein (CP), milk urea nitrogen (MUN), solid not fat (SNF) and somatic cell count (SCC) than HF group. It is concluded that restriction of F: C ratio to 91.7: 8.3% to bred heifers has the potential carryover effects to maintain higher milk yield and FE with no adverse effect on feed intake and milk composition of primiparous lactating Holstein cows.
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참고문헌 (42)
참고문헌 신청
Aguerre, M. J. / 2011 / Effect of forage to-concentrate ratio in dairy cow diets on emission of methane, carbon dioxide and ammonia, lactation performance and manure excretion / Journal of Dairy Science 94:3081~3093
AOAC / 1990 / Official methods of analysis / Association of Official Analytical Chemist International
Bielfeldt, J. C. / 2004 / Factors influencing somatic cell score in Swiss dairy production systems / Schweizer Archiv Tierheilk de 146:555~560
Carson, A. F. / 2000 / The effects of plane of nutrition and diet type on metabolic hormone concentrations, growth and milk production in high genetic merit dairy herd replacements / Animal Science 70:349~362
Ettema, J. F. / 2004 / Impact of age at calving on lactation, reproduction, health, and income in first –parity Holsteins on commercial farms / Dairy Science 87:2730~2742
AOAC / 1990 / Official methods of analysis / Association of Official Analytical Chemist International
Bielfeldt, J. C. / 2004 / Factors influencing somatic cell score in Swiss dairy production systems / Schweizer Archiv Tierheilk de 146:555~560
Carson, A. F. / 2000 / The effects of plane of nutrition and diet type on metabolic hormone concentrations, growth and milk production in high genetic merit dairy herd replacements / Animal Science 70:349~362
Ettema, J. F. / 2004 / Impact of age at calving on lactation, reproduction, health, and income in first –parity Holsteins on commercial farms / Dairy Science 87:2730~2742
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