EFFECTS OF COAT COLOR ON PRODUCTION AND REPRODUCTION OF DAIRY CATTLE ON ST. CROIX

R.W. Godfrey and P.J. Hansen

No 258758, 30th Annual Meeting, July 31-August 5, 1994, St. Thomas, U.S. Virgin Islands from Caribbean Food Crops Society

Abstract: Records obtained from a commercial dairy farm, covering a period of 26 years, were analyzed to evaluate the effect of coat color on milk production and reproduction in Holstein cows. There was no difference (P >. 10) in the amount of milk produced during the first lactation or length of the first lactation among cows with 25, 26-50, 51-75 or >75% black hair coat (BHC). Cows with > 75% BHC had more conceptions (P < .009) in January and February and fewer in March, April and June than cows with < 75% BHC (-2 = 25.16). Light colored cows ( 25% BHC) had shorter (P < .03) calving intervals than darker cows (> 25% BHC; 464 ± 14 vs 495 ± 5 d, respectively) independent of month of calving. These results indicate that milk production of Holstein cows in the tropics is not influenced by coat color but reproduction may be. Cows with more black surface area may be more susceptible to detrimental effects of heat stress because more solar radiation is absorbed as heat.

Keywords: Livestock Production/Industries; Research and Development/Tech Change/Emerging Technologies (search for similar items in EconPapers)
Pages: 7
Date: 1994-07-31
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://ageconsearch.umn.edu/record/258758/files/30_24.pdf (application/pdf)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:ags:cfcs94:258758

DOI: 10.22004/ag.econ.258758

Access Statistics for this paper

More papers in 30th Annual Meeting, July 31-August 5, 1994, St. Thomas, U.S. Virgin Islands from Caribbean Food Crops Society
Bibliographic data for series maintained by AgEcon Search ().