Genetic analyses for growth traits of two indigenous beef cattle breeds in Botswana

Raphaka, Kethusegile; Dzama, K.

doi:10.1016/j.livsci.2010.01.024

Cited by 4 publications

(6 citation statements)

References 24 publications

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“…This therefore signalled low chances of increased BWT hence minimal risk associated with calving difficulty when selecting for increased WWT, YWT, EWT or ADG1. The current values obtained for correlations are consistent with those reported by Raphaka and Dzama (2010) for the same breed and Maiwashe et al (2002) for Bonsmara breed. High correlation values obtained between WWT and each of ADG1, YWT, and EWT indicate that an increase in any of these weight traits can be attained through selection for WWT, hence the current results are in agreement with the findings of Burrow (2001) and Raphaka and Dzama (2010).…”

Section: Resultssupporting

confidence: 89%

“…The current values obtained for correlations are consistent with those reported by Raphaka and Dzama (2010) for the same breed and Maiwashe et al (2002) for Bonsmara breed. High correlation values obtained between WWT and each of ADG1, YWT, and EWT indicate that an increase in any of these weight traits can be attained through selection for WWT, hence the current results are in agreement with the findings of Burrow (2001) and Raphaka and Dzama (2010). Genetic correlation between YWT and EWT was also very high signifying that selection for one of these traits can actually yield correlated response in the other.…”

Section: Resultssupporting

confidence: 89%

“…The range of direct heritability values obtained in the current study were consistent with those reported by Meyer (1997) for BWT and WWT in Australian beef cattle and Demeke et al (2003) for BWT in Ethiopian indigenous breeds and their crosses. Direct heritability value obtained for ADG2 in the current study was similar to the value reported by Raphaka and Dzama (2010) for the same breed. On the other hand, they reported high direct heritability value for BWT and lower values for WWT, EWT and ADG1 than those obtained in the current study.…”

Section: Resultssupporting

confidence: 89%

“…The range of values obtained in the present study for maternal genetic heritabilities are within the range of estimates reported in literature for BWT (Groeneveld et al, 1998;Demeke et al, 2003;Iwaisaki et al, 2005), for WWT (Meyer, 1997;Costa et al, 2011;Boligon et al, 2012), for YWT and EWT (Groeneveld et al, 1998;Boligon et al, 2010;Costa et al, 2011), and for ADGs (Demeke et al, 2003;Raphaka and Dzama, 2010;Boligon et al, 2012). Permanent maternal environmental proportions from Model 3 were not significantly different from zero for BWT, YWT and EWT.…”

Section: Resultssupporting

confidence: 88%

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Estimates of covariance components and genetic parameters for growth traits in Tswana cattle selected for increased weaning or eighteen-month weights

M.¹,

S.²

2022

Int. J. Livest. Prod.

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The objective of this study is to estimate variance-covariance components and genetic parameters for growth traits in Tswana cattle. Genetic analyses for average daily gain (ADGs) and growth traits were conducted using 7223 records of animals which were born between 1996 and 2013 from 1662 dams and 188 sires in 54 contemporary groups. Both univariate and bivariate animal models were used. Heritability estimates for growth traits ranged from 0.12±0.03 for BWT to 0.45±0.03 for EWT while those obtained for ADGs were 0.24±0.03 and 0.31±0.04 for ADG1 and ADG2, respectively. Permanent maternal environmental effects were significant for WWT and ADG1. Substantial maternal genetic effects were observed in BWT, WWT and ADG1. Genetic correlations among growth traits and ADGs ranged from 0.19±0.07 between BWT and ADG1 to 0.99±0.02 between WWT and ADG1. Phenotypic correlations among growth traits and ADGs ranged from 0.19±0.01 between BWT and ADG1 to 0.94±0.01 between WWT and ADG1. The two selected lines significantly improved annual genetic gain for all the growth traits and ADG1. Genetic gain for EWT was optimally enhanced in S2 than in S1. The control line exhibited significant annual genetic gain in WWT which was not anticipated and perhaps attributed to asymmetry of selection response. Substantial genetic variations were observed in all growth traits and ADGs suggesting that growth improvement can be attained through selection for growth rate. High genetic correlations between growth traits and ADGs indicated that selection for one of these traits may result in indirect correlated response on the other traits.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 88%

See 2 more Smart Citations

Estimates of covariance components and genetic parameters for growth traits in Tswana cattle selected for increased weaning or eighteen-month weights

M.¹,

S.²

2022

Int. J. Livest. Prod.

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“…The Composite breed was developed in a controlled breeding programme using the Simmentaler, Brahman, Tswana, Tuli and Bonsmara breeds. Further details of the ranch conditions, breeds used and their management have been described by Raphaka (2008).…”

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confidence: 99%

Sex of calf and age of dam adjustment factors for birth and weaning weight in Tswana and Composite beef cattle breeds in Botswana

Raphaka

Dzama

2010

SA J. An. Sci.

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Records on 2 257 Composite and 5 923 Tswana calves born between the period of 1988 and 2006 in Botswana were used to calculate additive correction factors for the effects of sex of calf and age of dam on birth weight and weaning weight. The mature age group in both breeds for the two growth characteristics was 5-12 year old dams. Male calves were heavier than their female contemporaries throughout the preweaning growth period. The sex of calf adjustments for birth and weaning weights were 2.75 and 8.21 kg in the Tswana while the corresponding values for the Composite were 2.84 and 10.11 kg. Both birth and weaning weights increased with advancing age of dam, reaching a peak in mature dams and declined when dams reached an old age. Age of dam adjustment factors for birth weight in the 3, 4 and 13+ year age groups were, respectively, 1.74, 0.96 and 1.87 kg in the Tswana. Corresponding values for the Composite were 2.28, 0.94 and 2.06 kg, respectively. Age of dam adjustment factors for WW were respectively 10.36 and 5.46 kg for age groups 3-4 and 13+ years in the Tswana. Adjustment factors for weaning weight in the Composite breed were 13.84, 3.20 and 9.58 kg for age groups 3, 4 and 13+ years, respectively. These results indicate that adjustment factors for birth and weaning weights should be considered separately for sex of calf and age of dam in these breeds, and also, that these adjustments need to be applied within the breed from which they were derived.

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Adaptive Potential and Breeding Paradoxes of Sanga and Zebu Cattle

Mapfumo,

Washaya,

Mupangwa

et al. 2023

Asian J. of Animal and Veterinary Advances

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Genetic analyses for growth traits of two indigenous beef cattle breeds in Botswana

Cited by 4 publications

References 24 publications

Estimates of covariance components and genetic parameters for growth traits in Tswana cattle selected for increased weaning or eighteen-month weights

Estimates of covariance components and genetic parameters for growth traits in Tswana cattle selected for increased weaning or eighteen-month weights

Sex of calf and age of dam adjustment factors for birth and weaning weight in Tswana and Composite beef cattle breeds in Botswana

Adaptive Potential and Breeding Paradoxes of Sanga and Zebu Cattle

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