Indigenous Kids’ Growth and the Effects of non Genetic Factors in Pastoral Husbandry in Tunisian Arid Zone

Najari, Sghaier; Gaddour, Amor; Abdennebi, Mouldi

doi:10.3923/tasr.2012.231.239

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…During an animal's lifetime, essential weight gain is reached before maturity stage, and it is well known that animals achieve the target mature size in a well-defined sigmoid or S-shaped curve (Najari et al, 2007(Najari et al, , 2007b. Thus, typical curves are used to describe animal growth due to the general predictable pattern followed by the growth process (De Lange et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Growth curve estimation in pure goat breeds and crosses of first and second generation in Tunisian oases

Gaddour¹

2012

J. Cell Anim. Biol.

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Five non-linear statistical models were tested to fit the growth curve parameters of the kids of indigenous, Alpine and Damascus goats and their crosses. Data from 16 years' periodical weight study was used to adjust the growth curve of 1,687 suckling kids before they attained the age of five months. Among the tested models, the iterative procedure made it possible for the Gompertz model to be identified as the best for use to adjust kids' growth evolution. Brody, Richards, Logistic and Polynomial models showed some convergence problems of accuracy. Curve parameters were fitted by Gompertz model after about 16 iterations with a coefficient of determination (CD) value of 71%. Growth parameters were established by genetic groups and the shape of the curve changed with kids' genotypes. Crossbreeding allowed for a better growth kinetic in indigenous kids. After birth, kids' weights increased rapidly to an asymptotic weight at an early age. The best growth performances were obtained in the first generation of crossbreeding due to heterosis. The growth curve adjustment helped in better flock management and in the fattening of kids according to the potentialities of each genotype.

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Section: Introductionmentioning

confidence: 99%

Growth curve estimation in pure goat breeds and crosses of first and second generation in Tunisian oases

Gaddour¹

2012

J. Cell Anim. Biol.

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“…The natural zone affects kid's growth through the resources and the herd management not homogenous in studied ecological zone such as steppic, costal and mountainous zone (Ouled Belgacem 2006;Najari et al 2007b;El-Hassan et al 2009). In the coastal zone, the livestock plays a secondary role in the family incomes and the pastoral lands are regressing in favour to oil culture (Iheukwumere et al 2008;Tavsanoglu 2008).…”

Section: The Ecological Zone Effects On Kids' Growthmentioning

confidence: 99%

“…In fact, the zone allows raising more than 60% of the national caprine herd estimated about 1,500,000 goats (DGPA 2009;FAO 2010). Kids' meat represents about 75% of the local meat production (Das et al 2007;Najari et al 2007aNajari et al , 2007b. The main product of the traditional breeding mode of the indigenous goat is the meat of kids slaughtered is summer season (Argu¨ello et al 2004;Thavaprakaash and Velayudham 2010;Argu¨ello 2011).…”

Section: Introductionmentioning

confidence: 99%

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Early growth of the local kids and the effects of non-genetic factors in pastoral breeding mode in Tunisian arid zone

Najari¹,

Gaddour²,

Abdennebi³

2013

Journal of Applied Animal Research

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Data issued from a weighing protocol of 722 kids during four years was analysed to establish the impacts of nongenetic factors upon kids' weights at some standard ages. A Gompertz model was applied to estimate kids' weights at some standard ages 1, 10, 30, 60, 90, 120, 150 and 180 days. A GLM procedure and a means comparison test (SNK, a 00.05) were applied to identify the statistical effects of some factors and their homogenous classes at several ages. The determination coefficient R 2 remains lower than 87% of all studied traits due to the observed data structure. All traits seem to be affected (PB0.001 or 0.05) by the factors related to the restrictions and the irregularities of the technical and natural environment of pastoral husbandry. The nongenetic factors impact increases with kids' age and requirements. Growth traits varied depending to the natural and technical factors which illustrates the local population genetic response towards environmental resources in arid zone. The year and zone factors play an important role upon the kid's weight and it evolution till 6 months age due to the large inter-annual variation of rainfall. Also the technical level of the herder seems affecting highly the kids' performances. Therefore, arid environment affects both quantitatively and qualitatively individual kid's growing behaviour and have to be considered for local goat rational genetic improvement modelling and planning.

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“…If a female goat was not pregnant during the first mating period, it was transferred to the group that was mated at the next mating period (October-November, which corresponds to births in spring). The female kids were mated for the first time between 12 and 18 months of age, depending on their birth season (Najari et al 2007).…”

Section: Animals and Managementmentioning

confidence: 99%

Impact of simplified methods of growth recording on genetic parameter estimates of Tunisian local goat population under a low input production system

Atoui

Carabaño²,

Abdennebi

et al. 2020

Italian Journal of Animal Science

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Indigenous Kids’ Growth and the Effects of non Genetic Factors in Pastoral Husbandry in Tunisian Arid Zone

Cited by 5 publications

References 17 publications

Growth curve estimation in pure goat breeds and crosses of first and second generation in Tunisian oases

Growth curve estimation in pure goat breeds and crosses of first and second generation in Tunisian oases

Early growth of the local kids and the effects of non-genetic factors in pastoral breeding mode in Tunisian arid zone

Impact of simplified methods of growth recording on genetic parameter estimates of Tunisian local goat population under a low input production system

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