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Reproductive traits of Angus, Criollo and reciprocal crossbred females in the temperate area of Argentina

Published online by Cambridge University Press:  02 September 2010

P. M. Corva ,
E. L. Villarreal ,
C. A. Mezzadra  and
L. M. Melucci
P. M. Corva
Affiliation:
Facultad de Ciencias Agrarias de Balcarce, Universidad National de Mar del Plata, Casilla de Correo 276, 7620 Balcarce, Argentina
E. L. Villarreal
Affiliation:
Estación Experimental Agropecuaria Balcarce, Instituto National de Tecnologia Agropecuaria (INTA), Casilla de Correo 276, 7620 Balcarce, Argentina
C. A. Mezzadra
Affiliation:
Estación Experimental Agropecuaria Balcarce, Instituto National de Tecnologia Agropecuaria (INTA), Casilla de Correo 276, 7620 Balcarce, Argentina
L. M. Melucci
Affiliation:
Facultad de Ciencias Agrarias de Balcarce, Universidad National de Mar del Plata, Casilla de Correo 276, 7620 Balcarce, Argentina
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Abstract

Reproductive performance of purebred Angus (A) and Criollo (C) cows and crossbred CA and AC cows in the temperate area of Buenos Aires, Argentina, was assessed through the study of reproductive rates, calving date, first insemination date, number of inseminations and weight related variables. The herd was grazed on pastures all year round. Matings were by artificial insemination with visual oestrus detection, from October to December. Heifers first calving was at 3 years of age. All traits were analysed with general linear models including, as corresponded, fixed effects of dam and calf genetic groups, calving year and month, dam physiological status, calving age and first order interactions. Female genetic group adjusted means were used to estimate direct (gl) and maternal (gM) breed differences and heterosis (hl) effects on reproductive traits. Weaning rate was mostly determined by oestrons detection rate. Due to the inhibitory effects of nursing on reproduction, female genetic group effects were significant for suckling cows only: mean oestrous detection rate was higher (P < 0·05) for crossbred cows (AC: 91·2 (s.e. 5-1) %; CA: 88·4 (s.e. 2·9) %) than for A (76·3 (s.e. 2·0) %) and C (49·9 (s.e. 3·3) %); direct breed effects favoured A (glA - g1c = 26·4 (s.e. 3·7) %; P < 0·001) and h1 was 26·7 (s.e. 3·4) % (P < 0·001). When only oestrous-detected cows were considered, direct breed effects were significant only for pregnancy rate fg1A —g1c = 8·5 (s.e. 4·4) %) whereas h1 was significant for pregnancy (8·3 (s.e. 3·8) %), calving (9·3 (s.e. 4·1) %) and weaning (10·1 (s.e. 4·1) %) rates (P < 0·05). Criollo cows calved later than crossbred (≍19 days) and A (≍15 days) cows mainly due to longer post-partum anoestrous. For calving date, direct breed effects favoured A (g1A — g1c = 20·8 (s.e. 5·9) days; P <0·0·001) and h1 was 11·4 (s.e. 2·8) days (P < 0·001). Low reproductive performance in C was not associated with live iveight at the beginning of mating. This genetic group was the latest in showing oestrous behaviour, even when not suckling. Number of inseminations was similar for the four genetic groups. These results sustain the principle of utilizing Fl Criollo-Angus cows to improve beef herd productivity, whereas they do not support the recommendation of using purebred Criollo females under this type of production system.

Keywords

beef cowsbreed differencescrossbreedingheterosisreproductive traits
Type
Research Article
Information
Animal Science , Volume 61 , Issue 2 , October 1995 , pp. 241 - 249
Copyright
Copyright © British Society of Animal Science 1995

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