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Estimation of milk consumption curve parameters for different genetic groups of bovine calves

Published online by Cambridge University Press:  02 September 2010

C. Mezzadra ,
R. Paciaroni ,
S. Vulich ,
E. Villarreal  and
L. Melucci
C. Mezzadra
Affiliation:
Institutio National de Technología Agropecuaria, Estación Experimental Agropecuaria Balcarce, 7620 Balcarce (BA), Argentina
R. Paciaroni
Affiliation:
Institutio National de Technología Agropecuaria, Estación Experimental Agropecuaria Balcarce, 7620 Balcarce (BA), Argentina
S. Vulich
Affiliation:
Institutio National de Technología Agropecuaria, Estación Experimental Agropecuaria Balcarce, 7620 Balcarce (BA), Argentina
E. Villarreal
Affiliation:
Institutio National de Technología Agropecuaria, Estación Experimental Agropecuaria Balcarce, 7620 Balcarce (BA), Argentina
L. Melucci
Affiliation:
Institutio National de Technología Agropecuaria, Estación Experimental Agropecuaria Balcarce, 7620 Balcarce (BA), Argentina
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Abstract

Milk consumption was estimated for crossbred suckled calves from birth to weaning during 2 years. Breed groups utilized were Aberdeen Angus (A) and Charolais (C) sires on Fl Angus-Hereford (and their reciprocals) dams in the 1st year and in the 2nd year, sires A and Nelore (Bos indicus) (N) were used on the same type of dam. The weigh-suckle-weigh technique was employed twice a day to estimate milk consumption on a weekly basis. Estimations were adjusted by least-squares for the effects of genetic group, week of estimation, and their interaction, with sex of calf and calf and cow weights in the week of estimation as covariables. Then a non-lineal regression equation of the form: y = b0Wb1e -b2b2W was fitted for each individual, where y = milk consumption and W = week of estimation. Curves for A and C were very close in their shape, but with a greater consumption (P < 0·01) for C. For the 2nd year, there were differences among A and N both in the shape of the curve and in consumption at the peak of lactation (P < 0·01). Differences in time to peak lactation were also found: for A calves, it was week 9, for C calves week 10 and for N calves week 3·8. The N group showed a sharper decline in persistency than the other groups, suggesting different patterns in milk consumption.

Type
Research Article
Information
Animal Production , Volume 49 , Issue 1 , August 1989 , pp. 83 - 87
Copyright
Copyright © British Society of Animal Science 1989

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