This is the first study in which Holstein Friesian crossbreds were categorized based on pigmentation pattern of different phenotypic body parts, hump status, and known generations derived from controlled breeding and recordings. The aim of this study was to implement a sustainable breeding strategy for Holstein Friesian cattle in developing countries, where farm record keepings are not available or well developed. Data of peak milk production and morphological characteristics were collected on 51 Holstein Friesian crossbred cows after primary sorting from three districts of Bangladesh. The data analyses were conducted following one-way ANOVA with descriptive statistics. The animals were graded according to the color of horn, eyelid and eyelash, muzzle, hoof, tail switch, and the presence of a hump. It was observed that white color (18.86-22.00 liters) of different body parts of Holstein Friesian crossbreds were significantly (p <0.001) associated with higher milk production compare to black color (8.95-13.84 liters). Average peak milk production for humpless cows was 15.9 liters, compared to 4.8 liters for humped cows. The grading of cows showed significant differences (p <0.001) in milk production, but medium and higher grades were not significantly different. Black color found 100% in all studied body parts for lower graded cows while white color increased in medium graded (up to 75%) and almost full in higher graded cows except eyelid and eyelash (66.7% white). To prove the above findings, another 10 Holstein females with known genetics of exotic blood were evaluated for the same studies and similar trends were revealed with respect to the increasing of white color over black from the F1 generation (66.7% in hoof and 50% in tail switch) to F2 (25% in horn, 25% in muzzle, and 75% in hoof and tail switch), including 100% humpless characters. It is concluded that a planned breeding strategy could be designed according to the phenotypic characteristics to retain the exotic blood level. It is expected that such ratio would support the sustainability and minimize the problems linked with such higher blood level through random, unplanned and uncontrolled crossbreeding in the developing countries so far. Keywords: exotic blood, phenotypic color, dairy cows, genetic admixture, sustainability
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Genetic Gain - Breeding Strategies 1, , 144, 2018
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