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- W2073729034 abstract "Summary The lengths of intervals between estrual periods were studied in a herd which consisted of six sire lines of breeding and in which four systems of mating were practiced. The distribution and mean lengths of 766 estrual cycles and 191 return intervals from 221 heifers differed significantly (P An analysis of variance showed estrual-cycle length in heifers to be affected significantly by the season of birth and the system of mating. The summer- and spring-born heifers had the longest cycles, 25.0 and 25.2 days, whereas the winter- and fall-born had cycles averaging 22.2 and 20.9 days, respectively. Daughters of inbred dams had the longest mean cycle lengths, 24.9 days for the outbred daughters and 25.6 days for the inbred; daughters of outbred dams averaged 20.6 for those that were outbred and 22.2 for those that were inbred. An analysis of variance of the first estrual-cycle length following calving in outbred and inbred cows showed a significant interaction of sire line and system of mating. Repeatability estimates of the first estrual-cycle length following calving from one calving interval to another of 0.11 (P" @default.
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- W2073729034 date "1961-05-01" @default.
- W2073729034 modified "2023-09-27" @default.
- W2073729034 title "Variation in Estrual Cycles of Holstein-Friesian Cattle" @default.
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- W2073729034 doi "https://doi.org/10.3168/jds.s0022-0302(61)89830-5" @default.
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