A Discussion of the Genetic Aspects of Weight, Mature Weight and Rate of Maturing in Hereford and Angus Cattle

Brown, Jacquelyn A.; Brown, C. J.; Butts, W. T.

doi:10.2527/jas1972.344525x

Cited by 71 publications

(44 citation statements)

References 3 publications

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“…The genetic correlation between A and k was negative, agreeing with results found in literature (Talyor and Fitzhugh Jr., 1971;Brown et al, 1972;Calo et al, 1973;Duarte, 1975;López De Torre and Rankin, 1978;Nelsen et al, 1982;Perotto, 1992). The genetic correlation between k and P (I) was also negative.…”

Section: ) Chianina Breedsupporting

confidence: 90%

“…Observe that parameter k exhibited a negative genetic correlation coefficient with A, indicating that selection for faster maturity rates could result in a reduction in mature weights. Negative genetic correlation coefficients between maturity rate and mature weight were also found in the literature (Taylor and Fitzhugh Jr., 1971;Brown et al, 1972;Calo et al, 1973;Duarte, 1975;López De Torre and Rankin, 1978;Nelsen et al, 1982;Perotto, 1992).…”

Section: Correlations Among Growth Parameterssupporting

confidence: 68%

“…On the other hand, those that grew with fast maturity rates were lighter at maturity. An inverse relationship between mature weight and maturity rate was also observed in the literature (Taylor and Fitzhugh Jr., 1971;Brown et al, 1972;Duarte, 1975;Nelsen et al, 1982;Perotto, 1992;Bullock et al, 1993;Perotto et al, 1994). …”

Section: Growth Parameter Values Obtained With the Von Bertalanffy Modelsupporting

confidence: 66%

“…These estimates should be used under the hypothesis that they simulate the true biological model (Brown et al, 1972).…”

Section: Introductionmentioning

confidence: 99%

“…Genetic antagonism has been found between mature weight and maturity rate (Taylor and Fitzhugh Jr., 1971;Brown et al, 1972;Nelsen et al, 1982;Perotto, 1992;Bullock et al, 1993) higher maturity rates could lead to lighter weights at maturity. On the other hand, positive and high genetic correlations were found between mature weight and birth weight, as well as between mature weight and yearling weight (Bullock et al, 1993) and, according to Northcutt and Wilson (1993), heifer weight taken before maturity could be used in genetic evaluations of mature weight.…”

Section: Introductionmentioning

confidence: 99%

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Description and comparison of growth parameters in Chianina and Nelore cattle breeds

Carrijo

Duarte²

1999

Genet. Mol. Biol.

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Weight data from birth to 18 months of age of Nelore and Chianina, both meat-producing cattle breeds, were analyzed. Data were corrected for significant effects of environment and utilized to estimate genetic parameters through the non-linear von Bertalanffy model. Average values found for growth parameters in Nelore were: mature weight (A), 312.87 kg; integration constant (B), 0.49; maturity rate (k), 0.13; age at inflection point (T (I) ), 3.29 months; weight at inflection point (P (I) ), 92.70 kg, and maturity interval (1/k), 8.04 months. For the Chianina animals, the values were 751.38 kg, 0.59, 0.10, 6.64 months, 222.63 kg, and 10.98 months, respectively. Nelore animals exhibited higher maturity rate, smaller maturity intervals, reaching mature weights younger than Chianina animals, although lighter than these at maturity. Heritability estimates presented low values, mainly for mature weight (0.093 and 0.212), age at inflection point (0.062 and 0.202), weight at inflection point (0.093 and 0.212) and maturity interval (0.057 and 0.309) (for Nelore and Chianina, respectively). The parameters mature weight and weight at inflection point presented positive genetic correlations with weights at different ages and with similar trends, increasing as age increased, in both breeds. Considering the development period analyzed, from birth to 18 months of age, the parameter maturity rate and the weights at different ages showed genetic correlations which increased until the weight at 150 and 205 days in Nelore and Chianina, respectively, and decreased from these ages on, and the genetic correlations among the parameter maturity interval and the weights at different ages were negative. They decreased until the weights at 150 and 205 days, respectively, in Nelore and Chianina, and increased from these ages on.

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Section: ) Chianina Breedsupporting

confidence: 90%

Section: Correlations Among Growth Parameterssupporting

confidence: 68%

Section: Growth Parameter Values Obtained With the Von Bertalanffy Modelsupporting

confidence: 66%

“…These estimates should be used under the hypothesis that they simulate the true biological model (Brown et al, 1972).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Description and comparison of growth parameters in Chianina and Nelore cattle breeds

Carrijo

Duarte²

1999

Genet. Mol. Biol.

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Analysis of growth curve parameters of Gobra zebu females in Senegal

Abassa

1987

Trop Anim Health Prod

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Analysis of growth curve parameters was performed using body weight data collected from 1968 through 1980 at Dahra Research Station, Senegal. Month of birth had little or no effect on mature size and maturing rate. Females born from mid-wet through mid-dry seasons were likely to reach lighter mature weights than those born from mid-dry through mid-wet seasons. Year of birth affected both mature weight and maturing rate (P less than 0.01 and P less than 0.001 respectively). Sire had effects (P less than 0.05) on maturing rate and no effect on mature size. Genetic correlations between maturing rate and body weights at birth, weaning, 12 and 18 months were 0.45 +/- 0.51, -0.21 +/- 0.52, -0.61 +/- 0.57 and -0.76 +/- 0.51 respectively. Selection for maturing rate in Gobra females would be expected to decrease weaning and post-weaning weights. The least squares means of mature size and maturing rate were 398.83 +/- 45.81 kg and 0.187% per day respectively. Gobra zebu females were about 50 and 99% mature at about 12 and 87.6 months respectively.

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