The impact of hair coat color on longevity of Holstein cows in the tropics
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Background: Over two decades of observations in the field in South East Asia and Hawai‘i suggest that majority of the commercial dairy herds are of black hair coat. Hence a simple study to determine the accuracy of the observation was conducted with two large dairy herds in Hawaii in the mid-1990s. Methods: A retrospective study on longevity of Holstein cattle in the tropics was conducted using DairyComp-305 lactation information coupled with phenotypic evaluation of hair coat color in two large dairy farms. Cows were classified into 3 groups: a) black (B, >90%); b) black/white (BW, 50:50) and c) white (W, >90%). Cows with other hair coat distribution were excluded from the study. In farm A, 211 out of 970 cows were identified having 4 or more lactations. In farm B, 690 out of 1,350 cows were identified with 2 or more lactations for the study. Results: The regression analyses and the Wilcoxon-Log-rank test for survival probability showed that Holstein cattle with 90% black hair coat had greater longevity compared to Holstein cattle with 90% white hair coat. Conclusions: This study suggests that longevity of Holstein cattle in tropical regions was influenced by hair coat color and characteristics.
Abstract
Background: Over two decades of observations in the field in South East Asia and Hawai‘i suggest that majority of the commercial dairy herds are of black hair coat. Hence a simple study to determine the accuracy of the observation was conducted with two large dairy herds in Hawaii in the mid-1990s. Methods: A retrospective study on longevity of Holstein cattle in the tropics was conducted using DairyComp-305 lactation information coupled with phenotypic evaluation of hair coat color in two large dairy farms. Cows were classified into 3 groups: a) black (B, >90%); b) black/white (BW, 50:50) and c) white (W, >90%). Cows with other hair coat distribution were excluded from the study. In farm A, 211 out of 970 cows were identified having 4 or more lactations. In farm B, 690 out of 1,350 cows were identified with 2 or more lactations for the study. Results: The regression analyses and the Wilcoxon-Log-rank test for survival probability showed that Holstein cattle with 90% black hair coat had greater longevity compared to Holstein cattle with 90% white hair coat. Conclusions: This study suggests that longevity of Holstein cattle in tropical regions was influenced by hair coat color and characteristics.
참고문헌 (33)
- Andersen DE, "Genetic study of eye cancer in cattle", J Hered, 82(1), pp.21~26 (1991)
- Becerril CM, "Effects of percentages white coat color on Holstein production and reproduction in a subtropical environment", J Dairy Sci, 76, pp.2286~2291 (1993)
- Briquet R, "Heritability of amount of sporting in Holstein-Fresian cattle", J Hered, 38, pp.99~105 (1947)
- "Consensus" (2013)[URL]
- "The heat is on: climate change and heat waves in the midwest" (2007)[URL]
- Finch VA, "Why black goats in hot deserts? Effects of coat color on heat exchanges of wild and domestic goats", Physio Zool, 530, pp.19~25 (1980)
- Finch VA, "Coat colour in cattle: effect on thermal balance, behavior and growth and relationship with coat type", J Argic Sci (Camb), 102, pp.141~147 (1984)
- Frisch JE, "Changes occurring in cattle as a consequence of selection for growth rate in stressful environment", J Agric Sci (Camb), 96, pp.2338~ (1981)
- French GT, "A clinical and genetic study of eye cancer in Hereford cattle", Aus Vet J, 35, pp.474~481 (1959)
- Gebremedhin KG, "Modelling temperature profile and heat flux through irradiated fur layer", Transac ASABE, 40(5), pp.1441~1447 (1997)
- Sweating rate of dairy cows under shade and sunny environments, "Gebremedhin KG", ASABE, ~, pp.paper # 074083 (2007)
- Gilbert RP, "Hair coat characteristics and post-weaning growth of Hereford and Angus cattle", J Anim Sci, 69, pp.498~506 (1991)
- Godfrey RW, "Reproduction and milk yield of Holstein cows in the US Virgin Islands as influenced by time of year and coat color", Archivos Latinoamericanos de Production Animal, 4, pp.31~44 (1996)
- Hansen PJ, "Effects of coat color on physiological responses to solar radiation in Holsteins", Vet Rec, 127(13), pp.333~334 (1990)
- Hansen PJ, "Strategies for managing reproduction in the heat stress dairy cow", J Anim Sci, 77, pp.36~50 (1999)
- Hare E, "Survival rates and productive herd life of dairy cattle in the United States", J Dairy Sci, 89, pp.3713~3720 (2006)
- Impact of hair coat on thermoregulation of dairy cows to direct sunlight, "Hillman PE", ASABE, ~, pp.paper # 014031 (2001)
- King VL, "Effects of a hot climate on the performance of first lactation Holstein cows grouped by coat color", J Dairy Sci, 71, pp.1093~1096 (1988)
- Maia ASC, "Genetic variation of the hair coat properties and the milk yield of Holstein cows managed under shade in a tropical environment", Braz J Vet Res Anim Sci, 42(3), pp.180~187 (2005)
- Maia ASC, "Effective thermal conductivity of the hair coat of Holstein cows in a tropical environment", R Bras Zotec, 38(11), pp.2218~2223 (2009)
- Mariasegaram M, "The slick hair coat locus maps to chromosome 20 in Senepol-derived cattle", Anim Genetics, 38, pp.54~59 (2007)
- "Jersey rank first in US for productive life" (2009)[URL]
- Olson TA, "Evidence of a major gene influencing hair length and heat tolerance in Bos taurus cattle", J Anim Sci, 81(1), pp.80~90 (2003)
- Olson TA, "Effect of hair characteristics on the adaptation of cattle to warm climates", 8th World Congress on Genetics Applied to Livestock Production, pp.16~22 (2006)
- "Historic, dangerous heat wave scorches western USA" (2013)[URL]
- "Effects of hot climate on the performance of lactating Holstein cows grouped by percentage of white coat color" (1986)[URL]
- Turner HG, "The significance of coat type in cattle", Aust J Agric Res, 11, pp.645~663 (1960)
- Vries AD, "Cow longevity economics: The cost benefit of keeping the cow in the herd", Proceedings: Cow Longevity Conference, pp.22~52 (2013)
- Wadsworth M, "The productive lifetime of a dairy cow", proceedings: Cow Longevity Conference (2013)
- Walsberg GE, "Coat color and solar heat gain in animals", Bio Sci, 33(2), pp.88~91 (1983)
- "Pinkeye in beef cattle. Virginia Cooperative Extension publication 400–750" (2009)[URL]
- Woodward RR, "The hereditary aspect of eye cancer in Hereford cattle", J Anim, 9, pp.578~581 (1950)
- Yeates NTM, "Photoperiodicity in cattle: I. Seasonal changes in coat character and their importance in hear regulation", Aust J Agric Res, 6, pp.891~902 (1955)