Journal of Animal Production, Print ISSN: 2008-6776., Online ISSN: 2382-994X

Determination of energy requirement for maintenance and growth of growing turkey using comparative slaughter technique and relative growth index

Document Type : Research Paper

Authors

fatemeh fouladvand 1
Ali Kiani
seyed davood sharifi 2
Arash Azarfar 3

1 PhD Student, Animal Science Group, Agriculture Faculty, Lorestan University, Khoramabad, Iran

2 Associate Professor, Animal and Poultry Science Group, Pardis Aboreyhan, Tehran University, Tehran, Iran

3 Associate Professor, Animal Science Group, Faculty of Agriculture, Lorestan University, Khoramabad, Iran

https://doi.org/10.22059/jap.2019.267283.623327
Abstract
The aim of this study was to determine energy requirement for maintenance (MEm) and to estimate efficiency of energy utilization for gain (kg) using comparative slaughter technique (CST) and relative growth index (RGI: gain/BW0.75) in growing turkey chicks from one to four kg of live body weight (LBW). Forty male turkey chicks (24 days of age, 800 ± 93 g LBW) were fed a standard diet (12.3 MJ ME) up to 4 kg of LBW. Apparent metabolizable energy (AME, and AMEn), nutrient digestibility of the diet, and energy balance were determined at two and three kg of BW. In CST, twenty chicks were randomly killed at four stages (five birds at each stage) at 1119 ±60, 2539 ±93, 3528 ±68, 3957 ±82 g of body weight, and the chemical composition of carcass were measured. Maintenance energy requirement (MEm) and efficiency of energy utilization for gain were determined by linear regression in CST. In RGI, the MEm and energy for growth were estimated by a regression of ME intake and relative daily gain. The results showed that in CST, MEm and efficiency of energy utilization for gain were 450 (kJ/kg BW0.75/d), and 56% respectively. In RGI, the MEm and energy for growth were 3.66 (kJ/g BW0.75/d), and 10.4 kJ per g gain. In conclusion, using RGI method is recommended to estimate energy requirement for maintenance and growth in growing turkey due to its simplicity.

Keywords

Energy balance
Energy Efficiency
heat production
Metabolizable energy
Poultry
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Journal of Animal Production, Print ISSN: 2008-6776., Online ISSN: 2382-994X
Volume 21, Issue 2
Summer 2019
Pages 247-259

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