The Effect of Non-genetic Factors on Birth Weight and Weaning Weight in Three Sheep Breeds of Zimbabwe

Assan, Never; Makuza, S. M.

doi:10.5713/ajas.2005.151

Cited by 21 publications

(17 citation statements)

References 15 publications

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“…Average litter size in Dorper ewes was consistent with reports of Zishiri et al (2013) for the breed in native South Africa and those of Assan and Makuza (2005). Considerable lower values for litter size in Tsigai are reported by Krupova et al (2009) and Padeanu et al (2012).…”

Section: Resultssupporting

confidence: 85%

Reproduction Efficiency and Health Traits in Dorper, White Dorper, and Tsigai Sheep Breeds under Temperate European Conditions

Gavojdian

Budai

Cziszter

et al. 2015

Asian Australas. J. Anim. Sci

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The objective of the current pilot study was to evaluate the reproductive performance and health indicators in Dorper, White Dorper, and Tsigai breed ewes managed semi-intensively under European temperate conditions. A total of 544 ewe-year units were observed, with ewes (ranging from 1.5 to 8 years of age) managed under identical rearing conditions for a period of two consecutive production cycles (2012 through 2013 and 2013 through 2014). In general, significant (p≤0.001) genotype-related disparities were found in occurrence rates for all health parameters taken into study. Clinical mastitis incidence was significantly lower (p≤0.05) in Dorper (9.4%) and White Dorper (10.8%) breeds compared to that of Tsigai ewes (17.4%). Significant differences (p≤0.05) for lameness were found between Dorper and Tsigai breeds, with occurrence rates of 8.0% and 2.9%, respectively. Incidence for pneumonia and abortion was not influenced (p>0.05) by the ewes’ genotype. Litter size was significantly lower (p≤0.05) in White Dorper breed than for Dorper and Tsigai ewes, of 1.21, 1.40, and 1.45, respectively. Conception rates and lambs survival were not affected (p>0.05) by genotype. Results suggest that South African Dorper and White Dorper sheep breeds have adapted well to the specific rearing conditions.

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Section: Resultssupporting

confidence: 85%

Reproduction Efficiency and Health Traits in Dorper, White Dorper, and Tsigai Sheep Breeds under Temperate European Conditions

Gavojdian

Budai

Cziszter

et al. 2015

Asian Australas. J. Anim. Sci

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“…Traditionally, BW was an early measurable trait that attracted great interest because it had a positive genetic correlation with weights later in life [ 36 ]. Therefore, selecting for BW may be indirectly used to improve the survival rate of piglets [ 37 ].…”

Section: Discussionmentioning

confidence: 99%

Selection Response in a Divergent Selection Experiment for Birth Weight Variability in Mice Compared with a Control Line

García-Rebollar

Chavez

Ojeda

et al. 2020

Animals

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Birth weight (BW) in animal production is an economically important trait in prolific species. The laboratory mouse (Mus musculus) is used as an experimental animal because it is considered a suitable model for prolific species such as rabbits and pigs. Two mouse lines were divergently selected for birth weight variability with a third line of non-selected control population of the same origin as the animals starting the experiment. The objective of this study was, therefore, to compare and evaluate the differential response of each line. The animals were from the 17th generation of both low and high BW variability lines of the divergent selection experiment, including in addition animals from the control line. The dataset contained 389 records from 48 litters of the high line, 734 records from 73 litters of the low line, and 574 records from 71 litters of the control line. The studied traits were as follows: the BW, the BW variance, the BW standard deviation, the BW coefficient of variation within-litter, the weaning weight (WW), the litter size at birth and at weaning, the weight gain, and the preweaning survival. The model included the line effect jointly with the parturition number and its interaction, the linear and quadratic LS as covariates except for the LS trait itself when analyzing litter traits, as well as the pup sex when analyzing individual traits. The low line had a lower BW and WW, but a higher litter size, and greater robustness owing to a higher survival at weaning. As a model of livestock animals, the findings from this experiment led to a proposal of selection for pig production that would combine an increase in litter size with higher survival and welfare. Compared with the control line, a much higher response was observed in the low variability line than in the high line, making it extremely satisfactory given that homogeneity provides advantages in terms of animal welfare and robustness.

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“…The significant effects on the performance of lambs born in various years may result from numerous causes including variation in agro-climatic conditions, nutrition, type and quality of fodder, incidence of disease, breeder's skill, selection strategy, herdsman's ability to supervise labour, and financial resources (Dass et al, 2004;Assan & Makuza, 2005;Gbangboche et al, 2006;Vatankhah & Salehi, 2010;Al-Bial & Singh, 2012;Tohidi et al, 2017). In the present investigation, the SOB was divided into two major lambing seasons, that is, S1 (spring), S3 (autumn) (natural lambing seasons of small ruminants in Pakistan), and two minor (S2, summer; S4, winter) ones.…”

Section: Resultsmentioning

confidence: 99%

Analysis of non-genetic and genetic influences underlying the growth of Kajli lambs

et al. 2020

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Data on 2931 Kajli lambs, born from 2007 to 2018, were used to quantify environmental and genetic effects on growth performance of Kajli sheep. Traits considered for evaluation were birth weight (BWT), 120-day adjusted weight (120DWT), 180-day adjusted weight (180DWT), 270-day adjusted weight (270DWT), and 365-day adjusted weight (365DWT). Fixed effects of year of birth, season of birth, sex, birth type, and dam age on these traits were evaluated using linear procedures of SAS, 9.1. Similarly, BWT, 120DWT, 180DWT, and 270DWT were used as fixed effects mixed model analyses. Variance components, heritability and breeding values were estimated by restricted maximum likelihood. The genetic trend for each trait was obtained by regression of the estimated breeding values (EBV) on year of birth. Analyses revealed substantial influence of birth year on all traits. Sex and birth type were the significant sources of variation for BWT and 120DWT. Season of birth did not influence birth weight meaningfully, but had a significant role in the expression of 120DWT, 180DWT, and 270DWT. Heritability estimates were generally low (0.003 ± 0.018 to 0.099 ± 0.067) for all traits. With the exception of the genetic correlation of 180DWT and 365DWT, the genetic correlations between trait were strong and positive. Only 365DWT had a positive genetic trend. Although the heritability estimates for almost all weight traits were low, high and positive genetic correlations between BWT and other weight traits suggest that selection based on BWT would result in the improvement of other weight traits as a correlated response.Keywords: bodyweight, breeding value, genetic correlation, sheep

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The Effect of Non-genetic Factors on Birth Weight and Weaning Weight in Three Sheep Breeds of Zimbabwe

Cited by 21 publications

References 15 publications

Reproduction Efficiency and Health Traits in Dorper, White Dorper, and Tsigai Sheep Breeds under Temperate European Conditions

Reproduction Efficiency and Health Traits in Dorper, White Dorper, and Tsigai Sheep Breeds under Temperate European Conditions

Selection Response in a Divergent Selection Experiment for Birth Weight Variability in Mice Compared with a Control Line

Analysis of non-genetic and genetic influences underlying the growth of Kajli lambs

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