Reproductive performance of crossline and pureline dairy heifers

Data of 2779 purebred and crossbred heifers collected from five research stations of Agriculture Canada were used to study additive and nonadditive genetic effects on ages at first heat and at first breeding and conception rate at first service. Of these heifers, 2378 heifers had information on ages...

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Bibliographic Details
Published in:Journal of dairy science 1984-10, Vol.67 (10), p.2420-2428
Main Authors: Lin, C.Y, McAllister, A.J, Batra, T.R, Lee, A.J, Boy, G.L, Vesely, J.A, Wauthy, J.M, Winter, K.A
Format: Article
Language:English
Subjects:
Animals
BOVIN LAITIER
CANADA
Cattle - genetics
Cattle - physiology
CROSSBREDS
Crosses, Genetic
DAIRY CATTLE
Environment
Female
GANADO DE LECHE
GENISSE
HEIFERS
Hybrid Vigor
LIGNEE PURE
LINEAS PURAS
Models, Biological
NOVILLA
PERFORMANCE DE REPRODUCTION
PRODUCTOS DEL CRUZAMIENTO
PRODUIT DE CROISEMENT
PURE LINES
Reproduction
REPRODUCTIVIDAD
REPRODUCTIVITY
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Summary:Data of 2779 purebred and crossbred heifers collected from five research stations of Agriculture Canada were used to study additive and nonadditive genetic effects on ages at first heat and at first breeding and conception rate at first service. Of these heifers, 2378 heifers had information on ages at first conception and at first freshening, days from first service to conception, and gestation length. The model included station, year of birth, sire, breed additive, maternal, and heterosis effects where sire effects were treated as random. Station differences were a significant source of variation for all reproductive traits. Year of birth had significant effects on four of seven reproductive traits. Breed additive effects for all genetic groups were not significant except for Finnish Ayrshire and American Holstein. No significant maternal effects were detected. Of 21 combinations of heterosis effects, six combinations showed significance. Partial regression coefficients ranged from negative to positive, suggesting that breed additive, maternal, and heterosis effects could increase or decrease for each percent increase of genetic contribution, depending upon the trait, breed group, and type of inheritance.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(84)81590-8