Non-linear growth pattern for body weight height at withers and body length of Dorper sheep

Noraini I., . and Nor Amna A. M. N., . and Nooraisyah S., . and Taufikurahman B., . and Nasir J. M., . and Mohd Hafiz A. W., . and Hifzan R. M., . and Izuan Bahtiar A. J., . and Fadzlirahimi I., . Non-linear growth pattern for body weight height at withers and body length of Dorper sheep. pp. 11-17. ISSN 1394-3227

There is a dearth of information on age-weight relationship in indigenous and imported sheep breeds raised in tropical region especially in South East Asia. Growth curve parameters estimated from non-linear function are useful to determine optimum market and slaughter weights. The objective of this study was to estimate mature size for body weight body length and height at withers of Dorper ewes using Brody and Gompertz growth models. Cross-sectional data of body weight height at withers and body length of 126 Dorper ewes (birth to 6 y of age) were collected and fitted to growth models for estimation of mature size (A) constant of integration (B) and rate of maturing (k). Gompertz model showed higher R2 values for body weight body length and height at withers (96.4 99.6 and 99.6 respectively) compared to Brody (87.7 88.3 and 90.0 respectively). Mature size for body weight body length and height at withers estimated by Brody model were 62.811.833 kg 67.180.5771 cm and 66.901.609 cm respectively while Gompertz model estimated 60.341.486 kg 67.060.551 cm and 66.901.596 cm for body weight body length and height at withers respectively. Both models estimated negative correlation between parameter A and k for body weight body length and height at withers indicating that animals with faster rate of maturing grow faster towards their mature sizes but with smaller sizes compared animals of slower maturing rate.

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Abstract

There is a dearth of information on age-weight relationship in indigenous and imported sheep breeds raised in tropical region especially in South East Asia. Growth curve parameters estimated from non-linear function are useful to determine optimum market and slaughter weights. The objective of this study was to estimate mature size for body weight body length and height at withers of Dorper ewes using Brody and Gompertz growth models. Cross-sectional data of body weight height at withers and body length of 126 Dorper ewes (birth to 6 y of age) were collected and fitted to growth models for estimation of mature size (A) constant of integration (B) and rate of maturing (k). Gompertz model showed higher R2 values for body weight body length and height at withers (96.4 99.6 and 99.6 respectively) compared to Brody (87.7 88.3 and 90.0 respectively). Mature size for body weight body length and height at withers estimated by Brody model were 62.811.833 kg 67.180.5771 cm and 66.901.609 cm respectively while Gompertz model estimated 60.341.486 kg 67.060.551 cm and 66.901.596 cm for body weight body length and height at withers respectively. Both models estimated negative correlation between parameter A and k for body weight body length and height at withers indicating that animals with faster rate of maturing grow faster towards their mature sizes but with smaller sizes compared animals of slower maturing rate.

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Item Type:	Article
AGROVOC Term:	Sheep
AGROVOC Term:	Body measurements
AGROVOC Term:	Body size
AGROVOC Term:	Body weight
AGROVOC Term:	Length
AGROVOC Term:	Height
AGROVOC Term:	Age
AGROVOC Term:	Cross sectional analysis
AGROVOC Term:	Genetic improvement
AGROVOC Term:	Animal feeding
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:29
URI:	http://webagris.upm.edu.my/id/eprint/24715

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