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- W2053060701 abstract "Summary The effect of age of semen upon breeding efficiency has been investigated in an artificial breeding association during two management periods. During the first period, semen of all bulls was used for 3 days at ages of 5 to 13, 29 to 37 and 53 to 61 hr. and resulted in respective non-return rates of 63.3, 62.0 and 55.7 per cent. During the second period, all semen was used 2 days at ages of 18 to 26 and 42 to 50 hr. with respective non-return rates of 61.5 and 58.2 per cent. Differences between bulls and associations were significant, but no effect of season was noted. Bulls varied greatly in the decline of their breeding efficiency with age of semen but rapid decline was not associated with either a low or a high first day non-return rate." @default.
- W2053060701 created "2016-06-24" @default.
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- W2053060701 date "1951-12-01" @default.
- W2053060701 modified "2023-09-28" @default.
- W2053060701 title "The Efficiency of Artificial Breeding with Bull Semen One to Three Days Old" @default.
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- W2053060701 doi "https://doi.org/10.3168/jds.s0022-0302(51)91846-2" @default.
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