Metabolizable Energy Requirements for Growing Afshari Lambs: Insights from the Relative Growth Index Method
الموضوعات :
M. Bayat
1
,
A. Kiani
2
,
A. Azazi
3
1 - Department of Animal Science, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
2 - Department of Animal Science, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
3 - Department of Animal Science, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
الکلمات المفتاحية: energy recommendation, fat-tailed sheep, gain, Iranian Afshari sheep, relative growth index,
ملخص المقالة :
This study aimed to estimate the energy requirements for maintenance (MEm; kJ/BW0.75) and growth (MEg; kJ/g) in growing fat-tailed Afshari lambs using relative growth index (RGI). The RGI was calculated by dividing metabolic body weight (BW0.75) by average daily gain (ADG; g). Then, the MEm (kJ/BW0.75) and MEg (kJ/g) were extrapolated from the intercept and slope of a linear regression between RGI and me-tabolizable energy intake (MEI) per unit of gain. Forty-five healthy fat-tailed Afshari male lambs (average weight: 29.5±1.8 kg; age: 140±10 days), individually housed, were assigned to one of three feeding levels: ad libitum (ADL, n=15), 80% of ADL (R80, n=15), and 60% of ADL (R60, n=15). Based on the linear relationship between RGI and MEI per g of gain [ME (kJ)=614 RGI (kJ/BW0.75) + 17.4 (kJ/g ADG), R2=0.98, n=45, RMSE=9.65], MEm and MEg were 614 kJ/BW0.75, and 17.4 kJ per g of gain. The feed in-take level significantly influenced the predicted ADG of fat-tailed Afshari lambs based on the CNCPS-S model with larger discrepancies between observed and predicted ADG in the R60 group. In conclusion, this study indicates that the RGI method is a promising and accessible alternative method for estimating the energy needs of growing lambs. The implications of the results lay the groundwork for more refined, breed-specific feeding strategies for stakeholders that could enhance the productivity and sustainability of Afshari sheep farming.
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