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논문 기본 정보

자료유형
학술저널
저자정보
Jong Gwan Joo (Chungbuk National University) Kim Margarette C. Nogoy (Chungbuk National University) Jihwan Park (ThinkforBL Consultancy Services) Sunil Chon (ThinkforBL Consultancy Services) Dong Hoon Lee (Chungbuk National University) Seong Ho Choi (Chungbuk National University)
저널정보
충남대학교 농업과학연구소 Korean Journal of Agricultural Science Korean Journal of Agricultural Science Vol.48 No.1
발행연도
2021.3
수록면
45 - 57 (13page)

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초록· 키워드

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This study aimed to determine the effects if ambient temperature (Ta), relative humidity (RH), and temperature-humidity index (THI) on milk production parameters such as milk yield, fat, protein, milk urea nitrogen (MUN), and lactose. A total of fifty (50) mid-lactating Korean Holstein cows (144 - 150 days postpartum) were randomly assigned to two groups in equal numbers (n = 25) according to the type of diet received: conventional feed, a mixture of 56: 44 ratio of roughage and concentrate mix, and organic feed containing 100% organic roughage. Temperature, RH, and THI were recorded daily and averaged monthly. Conventional group showed higher dry matter intake throughout the experiment and thus, showed higher total milk yield and milk composition such as milk fat, protein, and lactose content than organic milk. Milk of the conventional group showed higher polyunsaturated fatty acid concentration. Highest milk yield was observed in September (21.7℃, 82.4%RH) in conventional group (27.69 kg·day<SUP>-1</SUP>) and in June (21.4℃, 72.9%RH) in organic group (14.31 kg·day<SUP>-1</SUP>). In conventional group, milk yield was positively correlated with Ta and THI, and milk protein was negatively correlated with Ta, RH, and THI. In organic feeding, only the MUN among milk composition parameters showed a significant correlation where it showed a negative correlation with Ta, RH, and THI. Conventional feeding showed significantly higher milk yield, fat, protein, and lactose than organic feeding throughout the experiment, although, organic feeding showed to be less likely affected by Ta, RH, and THI than the conventional feeding.

목차

Abstract
Introduction
Materials and Methods
Results and Discussion
References

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