Factors Affecting Growth Curve Parameters of Hereford and Brangus Cows

Torre, G López de; Rankin, Bobby J.

doi:10.2527/jas1978.463604x

Cited by 16 publications

(9 citation statements)

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“…These observations agree with other authors' results (Brown et al, 1976;López De Torre and Rankin, 1978;Perotto et al, 1994). Note that the Chianina breed had slower maturity rates, and consequently, their maturity intervals were longer than Nelore.…”

Section: Growth Parameter Values Obtained With the Von Bertalanffy Modelsupporting

confidence: 83%

“…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: 81%

“…These results were also observed by Brown et al (1976), López De Torre andRankin (1978) and Perotto et al (1994). The parameter 1/k was negatively correlated genetically with parameters A, B and P (I) , suggesting that selection for shorter maturity intervals could increase birth weight and weight at inflection point.…”

Section: ) Chianina Breedsupporting

confidence: 76%

“…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 Parametersmentioning

confidence: 63%

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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: Growth Parameter Values Obtained With the Von Bertalanffy Modelsupporting

confidence: 83%

Section: ) Chianina Breedsupporting

confidence: 81%

Section: ) Chianina Breedsupporting

confidence: 76%

Section: Correlations Among Growth Parametersmentioning

confidence: 63%

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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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“…This observation is contrary to what has been reported in Hereford and Angus cattle (Lopez de Torre and Rankin, 1978). Their study, however, did not include birth weight and preweaning growth data as in our study and this may be the possible reason for this contradiction.…”

Section: Resultscontrasting

confidence: 85%

Influence of Terminal Age of Weighing on Growth Curve Parameters in N'dama Cattle

Ahunu

Osei-Amponsah

1996

Journal of Applied Animal Research

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Ahunu, B.K. and Osei-Amponsah, R. 1996. Influence of terminal age of weighing on growth curve parameters in N'dama cattle. J. Appl. Anim. Res., 10 49-58. The effects of year, season of birth and age on growth curve parameters of the Brody's model in Ndanza cattle were studied.Year effects and both linear and quadratic terms of age fitted as covariates were significant (PcO.01) for all the three growth parameter estimates A, B and K. Mean estimates of the three parameters stabilized at slightly different ages. However, based on estimates of rate of maturing and closeness of fit, growth parameters may be derived after 55 months as reported (4.5 years) for Angus cattle. Also strong negative correlations hetween A and K suggested that early maturing animals were less likely to attain heavy mature weights.

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Analysis of growth patterns in purebred Kambing Katjang goat and its crosses with the German Fawn

Tsukahara

Chomei

Oishi

et al. 2008

Small Ruminant Research

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The objective of this study was to investigate growth patterns of goats utilizing data from a crossbreeding program involving the exotic German Fawn (GF) and the indigenous Kambing Katjang (KK) goats. Growth curve models and growth curve parameters were compared and analyzed for different genotypes and litter types. A total of 20,393 weight-age data from 208 female goats belonging to various crossbreeding genotypes were individually fitted to four growth curve models (Brody, Bertalanffy, Gompertz and Logistic). The goodness of fit was highest in the Brody model in most cases. A comparison of R2 among genotypes showed that they were highest for KK. There were no significant differences of genotypes for estimated mature weight in the Brody model. The estimated mature weights for KK were significantly lower (P < 0.05) than for GF × KK (F1), backcrosses with 75% GF genes (BC) and F1 × F1 (F2) in the other models. The correlations between estimated mature weights and the maturing rates were lowest for BC. The genotype significantly (P < 0.01) affected the age at the constant degree of maturity (67% and 90% of mature weight) in all models. The BC genotype was the youngest at maturity and KK the oldest. All models well expressed the growth pattern of the target animals when they were older than 2.5 years of age. The results from the present study showed that the growth pattern may be altered by crossbreeding of KK with the GF breed.

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Factors Affecting Growth Curve Parameters of Hereford and Brangus Cows

Cited by 16 publications

References 0 publications

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

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

Influence of Terminal Age of Weighing on Growth Curve Parameters in N'dama Cattle

Analysis of growth patterns in purebred Kambing Katjang goat and its crosses with the German Fawn

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