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Journal of Dairy Science Vol. 65 No. 7 1364-1371
© 1982 by American Dairy Science Association ®
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Performance of Jamaica Hope Cattle in Commercial Dairy Herds in Jamaica1

C. P. Schneeberger2, K. E. Wellington3 and R. E. McDowell2

Research Department, Ministry of Agriculture, Kingston, Jamaica
and Cornell University, Ithaca, NY 14853

ABSTRACT

Performance of Jamaica Hope cattle, developed in Jamaica from a crossbred foundation containing about 80% Jersey, 15% Sahiwal, and 5% Holstein breeding, was evaluated. There were 8,819 lactation records for 1969 to 1975 of Jamaica Hope and other cows from 28 herds for estimates of environmental effects. Herd, year, season, and age affected milk yield. Milk yield declined from 3890 kg in 1969 to 2658 kg in 1975. Effects of season and age of calving were small (5 and 13%). Progeny of Jamaica Hope sires were below other cows in milk yield (2732 versus 3013 kg). Phenotypic correlations among milk yield, lactation length, and body weight were positive but were negative for milk yield and days dry. Lactation length accounted for about 35% of the variation in milk yield whereas days dry and body weight contributed less than 10%. Total variance for milk was small, 749,283 kg2. Percentages of total variance in milk yield attributed to herd, sire, cow, and error were 29, 9, 46, and 16. For milk yield, heritability was .35 and repeatability .77. Sire values for 62 Jamaica Hope sires with at least 5 daughters were +243 to —300 kg. Factors that affect performance of Jamaica Hope do not appear greatly different from those influencing other breeds in tropical areas.

FOOTNOTES

1 This work was part of the Southern Regional Dairy Cattle Breeding Project, S-49 (Genetic Methods for Improving Dairy Cattle for the South).

2 Department of Animal Science.

3 Ministry of Agriculture, Hope Gardens, Kingston, Jamaica.






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