ArticleVeterinary medicine and science2024
The comparisons of non-linear models to describe the growth performance of Lori-Bakhtiari sheep.
Article in Veterinary medicine and science, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- A non-invasive approach to characterizing meat potential in the conservation-priority Kaçeli sheep breed using ultrasonography.Tropical animal health and production · 2026Article
- The comparisons of non-linear models to describe the growth performance of Lori-Bakhtiari sheep.Veterinary medicine and science · 2024Article
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2 authors.
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Abstract
backgroundThe study of growth traits is of interest to many animal scientists, regardless of specialization, due to the economic importance of growth rate, mature weight and other related traits.
objectiveThis study aimed to compare six non-linear models for describing the growth of Lori-Bakhtiari sheep.
methodsIn order to collect weight data, 85 lambs (41 males and 44 females) were reared from birth to 140 days of age, and their growth patterns were recorded by measuring their body weight at 10-day intervals. Various mathematical functions, including the negative exponential, Brody, Gompertz, Logistic, Morgan-Mercer-Flodin (MMF) and Weibull, were used to model the relationship between body weight records and age.
resultsThe results showed that the MMF and Gompertz models provided the best fit to the body weight data, whereas the negative exponential model exhibited the worst fit. In all models, the asymptotic weight of male lambs was higher than females. The research also revealed differences in growth patterns between male and female lambs. Overall, females had a lower absolute growth rate than males, but they reached their peak growth at an earlier period, and their growth rate declined faster.
conclusionsThe differences in growth patterns between males and females indicate the importance of analysing male and female data separately when describing growth. As a result, Gompertz model can be recommended to Lori-Bakhtiari female and male lamb breeders to determine more accurate growth traits. In addition, it should be considered that feeding male and female lambs separately according to absolute growth rate values may increase growth performance.
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