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Rotation Crossbreeding with Sahiwal and Ayrshire Cattle in the Tropics¹

US Department of Agriculture, Clay Center, NE 68933
and International Livestock Centre for Africa, Nairobi, Kenya

ABSTRACT

Data were analyzed for two breeding groups of cattle that were either 67% Sahiwal-33% Ayrshire or 33% Sahiwal-67% Ayrshire produced in a continuous two-breed rotation crossbreeding system at sea level on the Indian Ocean in Kenya at 003.5° latitude south. Characters in the analysis were age at first calving, calving interval, lactation yield, annual lactation yield, birth weight, average daily gain from birth to 50 kg, average daily gain from 50 to 90 kg, average daily gain from birth to 90 kg, and calf survival. The 33% Sahiwal-67% Ayrshire breeding group had a significant advantage over the 67% Sahiwal-33% Ayrshire breeding group in all characters except calf survival, calving interval, and birth weight.

¹ This study was conducted while K. E. Gregory served as a consultant to the International Livestock Centre for Africa.

² Roman L. Hruska US Meat Animal Research Center. Agricultural Research, Science and Education Administration, US Department of Agriculture, Clay Center, NE 68933.

³ International Livestock Centre for Africa, P. O. Box 46847, International House, Nairobi, Kenya.