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Animals (Basel). 2019 May 30;9(6). pii: E299. doi: 10.3390/ani9060299.

Assessment of Residual Feed Intake and Its Relevant Measurements in Two Varieties of Japanese Quails (Coturnixcoturnix japonica) under High Environmental Temperature.

Author information

1
Department of Animal Production and Breeding, College of Agriculture and Veterinary Medicine, Qassim University, Al-Qassim 51452, Saudi Arabia. mmfathi@fulbrightmail.org.
2
Department of Poultry Production, Faculty of Agriculture, Ain Shams University, HadayekShoubra 11241, Cairo, Egypt. mmfathi@fulbrightmail.org.
3
Department of Animal Production and Breeding, College of Agriculture and Veterinary Medicine, Qassim University, Al-Qassim 51452, Saudi Arabia. homidani@yahoo.com.
4
Department of Animal Production and Breeding, College of Agriculture and Veterinary Medicine, Qassim University, Al-Qassim 51452, Saudi Arabia. tarkamin@gmail.com.
5
Department of Poultry Production, Faculty of Agriculture, Kafrelsheikh University, 33516 Kafr El-Sheikh, Egypt. tarkamin@gmail.com.
6
Department of Poultry Production, Faculty of Agriculture, Ain Shams University, HadayekShoubra 11241, Cairo, Egypt. galaly2k_2005@yahoo.com.
7
Department of Animal Production and Breeding, College of Agriculture and Veterinary Medicine, Qassim University, Al-Qassim 51452, Saudi Arabia. osama_emera@yahoo.com.
8
Animal Production Research Institute, Agriculture Research Center, Dokki 12618, Giza, Egypt. osama_emera@yahoo.com.

Abstract

Three hundred and ten 12-week-old laying Japanese quails (Coturnixcoturnix japonica) from gray and white varieties (155 each) were randomly selected from the initial population and kept in individual battery cages. The measurements of growth and egg production were determined to derive residual feed intake (RFI). The relationship between RFI and egg quality, blood parameters, and carcass characteristics was also determined. The results indicated that the gray quails had significantly higher egg mass and lower broken eggs compared to the white quails. A significant increase of eggshell strength and shell percentage was found in eggs produced from gray quails compared to their white counterparts, although their shell thickness means weresimilar. The results of multiple regression analysis clearly identified a significant effect of metabolic body weight and egg mass for the computation of expected feed intake, rather than body weight gain, in both varieties of Japanese quails. A strong positive correlation between RFI and feed intake in both gray and white quail varieties was found. The same trend was also observed for feed conversion ratio (FCR). Therefore, including RFI in the selection criteria of Japanese quails in order to improve FCR under high environmental temperature is highly recommended.

KEYWORDS:

high environmental temperature; quail; residual feed consumption

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