Examination of non-genetic factors affecting the growth performance of djallonke sheep in soudanian zone at the Okpara breeding farm of Benin

Gbangboche, A. B.; Youssao, A. K. I.; Senou, M.; Adamou-Ndiaye, M.; Ahissou, A.; Farnir, Frédéric; Michaux, Charles; Abiola, F. A.; Leroy, Pascal

doi:10.1007/s11250-006-4231-9

Cited by 24 publications

(18 citation statements)

References 21 publications

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“…High values of the parameter k indicate that the animals reach maturity earlier (Brown et al, 1976;Carolino and Gama, 1993;McManus et al, 2003), and, as can be observed in Table 3, females have a higher rate of maturity (between 0.005 and 0.028) than males (between 0.003 and 0.027), as was also observed by Bathaei and Leroy (1998), Gbangboche et al (2008), Ulutas et al (2010), and, consequently, have a lower weight at maturity. The growth rates estimated by these models showed that females grow at a higher rate than males, although the differences between males and females were quite small, and always in favour of females, as reported in previous studies (Bathaei and Leroy, 1998;Gbangboche et al, 2006;Ulutas et al, 2010). The Brody model estimated the lowest growth rates for males and females, whereas the Verhulst model estimated the highest growth rates in both sexes.…”

Section: Resultssupporting

confidence: 81%

Characterization of commercial and biological growth curves in the Segureña sheep breed

Lupi

Nogales

León³

et al. 2015

Animal

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Non-linear models were analysed to describe both the biological and commercial growth curves of the Segureña sheep, one of the most important Spanish breeds. We evaluated Brody, von Bertalanffy, Verhulst, logistic and Gompertz models, using historical data from the National Association of Segureña Sheep Breeders (ANCOS). These records were collected between 2000 and 2013, from a total of 129 610 weight observations ranging from birth to adulthood. The aim of this research was to establish the mathematical behaviour of body development throughout this breed's commercial life (birth to slaughter) and biological life (birth to adulthood); comparison between both slopes gives important information regarding the best time for slaughter, informs dietary advice according to animals' needs, permits economical predictions of productions and, by using the curve parameters as selection criteria, enables improvements in growth characteristics of the breed. Models were fitted according to the non-linear regression procedure of statistical package SPSS version19. Model parameters were estimated using the Levenberg-Marquardt algorithm. Candidate models were compared using the determinative coefficient, mean square error, number of iterations, Akaike information coefficient and biological coherence of the estimated parameters. The von Bertalanffy and logistic models were found to be best suited to the biological and commercial growth curves, respectively, for both sexes. The Brody equation was found to be unsuitable for studying the commercial growth curve. Differences between the parameters in both sexes indicate a strong impact of sexual dimorphism on growth. This can emphasize the value of the highest growth rate for females, indicating that they reach maturity earlier.Keywords: growth, models, sex, sheep, Zootechny ImplicationsNon-linear models can be an option to establish the mathematical behaviour of body development throughout the life of the Segureña sheep breed. These models require lower computational and faster convergence than other methods. Moreover, in genetic evaluation programmes with large data sets, non-linear models are more advantageous. The results showed a strong impact of sexual dimorphism on growth.

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Section: Resultssupporting

confidence: 81%

Characterization of commercial and biological growth curves in the Segureña sheep breed

Lupi

Nogales

León³

et al. 2015

Animal

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“…Indeed, the first-parity ewes are still growing, implying the competition for nutrient with the foetuses (London and Weniger, 1995). The incidence of year ( Figure 3b) was reported in previous studies (Ebangi et al, 1996and Gbangboche et al, 2006aand 2006b) and could be due to the changes during the year, in management, herdsman's skills and other environmental factors.…”

Section: Model Parameterssupporting

confidence: 54%

“…The shape of the growth curve showed that male ( Figure 2a) and single lambs ( Figure 2b) were heavier than female and twin lambs, respectively. The higher weight of male than female has been described in WAD sheep (London and Weniger, 1995;Ebangi et al, 1996;Gbangboche et al, 2006b) and could be attributed to the hormonal and physiological differences between sexes (Ebangi et al, 1996). The superiority of single lambs over Selected model: A is the predicted asymptotic weight at maturity (kg), B is the proportional difference between A and birth weight (kg) and k is the rate of maturating.…”

Section: Model Parametersmentioning

confidence: 93%

“…In Benin, the WAD sheep is raised exclusively for meat and was estimated at 700 000 (Faostat, 2005), and play an important economical, social and cultural roles. For this purpose in West and Central Africa, the genetic and non-genetic effects on the growth performance of WAD sheep had become an attractive study in last decades to improve overall productivity (London and Weniger, 1995;Yapi-Gnaoré et al, 1997;Gbangboche et al, 2006a and2006b). However, the advantage of growth models such as Logistic and Gompertz (Renne et al, 2003;Lambe et al, 2006), Von Bertalanffy (Topal et al, 2004) and Brody model (Bathaei and Leroy, 1998), which give an explanation of what is biologically occurring during the growth phase of an animal, and their importance on breeding program (Varona et al, 1997;Lewis and Brotherstone, 2002) were unknown in WAD sheep.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of non-linear growth models to describe the growth curve in West African Dwarf sheep

Gbangboche

Kakaï

Salifou

et al. 2008

Animal

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The objectives of this study were to compare the goodness of fit of four non-linear growth models, i.e. Brody, Gompertz, Logistic and Von Bertalanffy, in West African Dwarf (WAD) sheep. A total of 5274 monthly weight records from birth up to 180 days of age from 889 lambs, collected during 2001 to 2004 in Betecoucou breeding farm in Benin were used. In the preliminary analysis, the General Linear Model Procedure of the Statistical Analysis Systems Institute was applied to the dataset to identify the significant effects of the sex of lamb (male and female), type of birth (single and twin), season of birth (rainy season and dry season), parity of dam (1, 2 and 3) and year of birth (2001, 2002, 2003 and 2004) on the observed birth weight and monthly weight up to 6 months of age. The models parameters (A, B and k), coefficient of determination (R 2 ), mean square error (MSE) were calculated using language of technical computing package Matlab R , 2006. The mean values of A, B and k were substituted into each model to calculate the corresponding Akaike's Information Criterion (AIC). Among the four growth functions, the Brody model has been selected for its accuracy of fit according to the higher R 2 , lower MSE and AIC. Finally, the parameters A, B and k were adjusted in Matlab R , 2006 for the sex of lamb, year of birth, season of birth, birth type and the parity of ewe, providing a specific slope of the Brody growth curve. The results of this study suggest that Brody model can be useful for WAD sheep breeding in Betecoucou farm conditions through growth monitoring.

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“…Several different growth models have been used to describe the growth pattern and development of body weight in pigs (Knap, 2000;Wellock, 2004;Koivula et al, 2008), cattle (Brown et al, 1976;Beltran et al, 1992;Berry et al, 2005), and sheep (Lewis et al, 2002;Gbangboche et al, 2006;Gbangboche et al, 2008). Fixed (Afolayan et al, 2006) and random polynomial regression (Meyer, 2005) Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/livsci have also been used.…”

Section: Introductionmentioning

confidence: 99%

Comparison of fixed effects and mixed model growth functions in modelling and predicting live weight in pigs

et al. 2015

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Examination of non-genetic factors affecting the growth performance of djallonke sheep in soudanian zone at the Okpara breeding farm of Benin

Cited by 24 publications

References 21 publications

Characterization of commercial and biological growth curves in the Segureña sheep breed

Characterization of commercial and biological growth curves in the Segureña sheep breed

Comparison of non-linear growth models to describe the growth curve in West African Dwarf sheep

Comparison of fixed effects and mixed model growth functions in modelling and predicting live weight in pigs

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