Phenotypic evaluation of fertility traits and their association with milk production of Italian Friesian cattle

The effect of environmental factors on first service conception rate, days from calving to first service, weeks from calving to conception, days from first to second service, and number of services per conception and the relationship of production with reproductive performance were estimated using 1...

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Bibliographic Details
Published in:Journal of dairy science 1994-03, Vol.77 (3), p.874-882
Main Authors: Bagnato, A, Oltenacu, P.A
Format: Article
Language:English
Subjects:
Aging
Animal productions
Animals
Biological and medical sciences
Cattle - genetics
Cattle - physiology
Female
FENOTIPOS
FERTILIDAD
FERTILITE
Fertility
Fundamental and applied biological sciences. Psychology
ITALIA
ITALIE
Italy
Lactation
MODELE
MODELOS
Parity
PHENOTYPE
Pregnancy
PRODUCCION LECHERA
PRODUCTION LAITIERE
RACE
RAZAS
Reproduction
Seasons
Terrestrial animal productions
VACAS LECHERAS
VACHE LAITIERE
Vertebrates
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Summary:The effect of environmental factors on first service conception rate, days from calving to first service, weeks from calving to conception, days from first to second service, and number of services per conception and the relationship of production with reproductive performance were estimated using 1.42 million records. The production trait was 305-d mature equivalent milk production. Season and age affected fertility: reproductive performance was lowest for lactations initiated during warm months (May to July) and decreased with parity. The association of production and fertility was antagonistic. High producing cows had 12 d more from calving to first service, 0.15 lower first service conception rate, 0.32 more services per conception, and 4.8 wk more from calving to conception than low producing cows in the same herd. The negative effect of production on fertility was reduced by superior herd management associated with high production. The difference in reproductive performance of cows in high and low producing herds represented only about 35% of the difference in the performance of high and low producing cows within herds for all fertility traits. The negative effect of production on fertility for interval between first and second service was totally compensated for by better management
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(94)77022-3