A Comparison of the Fertility of Bull Semen Diluted in Egg Yolk–Citrate and Homogenized Milk

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Abstract
A 4-month field trial to compare heated milk with egg yolk-citrate as an extender for bull spermatozoa. There were 19,939 1st services with 10,012 bred with milk diluted semen and 9927 bred with yolk-citrate diluted semen. No statistically significant difference was found between the fertility of semen diluted with milk and that with yolk-citrate. A highly significant difference was found in the percent non-returns between 2-day old and 3-day old semen with milk and yolk diluters. Milk diluter gave the best results with 2-day old semen while yolk-citrate diluter was best with 3-day old semen. There was a drop of 4.8% from 2-day old to 3-day old semen with yolk-citrate and 11.2% drop with milk. A statistically significant difference was found between bulls. Bulls of lower fertility with yolk-citrate diluter showed the greater improvement in percent nonreturns after change to milk extender.