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Effects of lactation on the reproduction of dairy cattle



Effects of lactation on the reproduction of dairy cattle



Korean Journal of Animal Science 29(4): 159-163



To study the relationships between lactation and reproduction traits, 19 heads of Holsteins were used. From December, 1983 to July, 1986 milk yields were measured during lactation through 3-4th parity every month by calving month. Calving interval and services per conception (SPC) were also measured by parity and by calving month. Followings are the main results obtained from this experiment. 1. After calving the average daily milk yield increased sharply for 2 month and then decreased continuously until the end of lactation. 2. The average daily milk yield increased as the parity increased upto 3-4th parity and the average daily milk yield of cows calved in July, August and September was less than that of cows calved in other months of the year. 3. There was no significant difference among parities or calving months in calving interval. However, SPC increased as the parity increased and SPC of cows calved from July to December was more than that of cows calved from January to June. 4. The correlation coefficients between lactation length and calving interval, lactation length and SPC, and calving interval and SPC were 0.799, 0.312 and 0.344, respectively.

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