Studies on Sexual Dimorphism in a Cross River Ecotype Local Chicken – Rose Comb (Gallus gallus domesticus)
In Cross River, researchers looked into sexual dimorphism in the local chicken (Gallus gallus domesticus)-Rose Comb. The influence of sex on body weight (BW), body length (BL), body girth (BG), thigh length (TL), shank length (SL), and keel length (KL) was measured fortnightly for twelve (12) weeks on sixty (60) male and female Gallus gallus domesticus chickens. To confirm the relative contribution of each characteristic to overall dimorphism, the Sexual Size Dimorphism Index (SSDI) and Sexual Dimorphism Index (SDI) were used. BW had SSDI and SDI values of 1.61 and 61 percent, TL had 1.26 and 26.52 percent, SL had 1.23 and 23.81 percent, BL had 1.22 and 21.50 percent, BG had 1.18 and 18.20 percent, and KL had 1.17 and 17.94 percent. Stepwise discriminate analysis was used to find the best feature for predicting sex, yielding Wilk’s Lamda values of BW(0.471); TL(0.452); SL(0.401); BL(0.283); BG(0.272); and KL(0.471) (0.271). At week 6, all measured parameters exhibited significant (p0.05) differences, with mean BW, BL, BG, SL, KL, and TL of 300.01 and 253.24; 22 and 18.62; 5.20 and 3.98; 4.60 and 3.50; 5.50 and 3.90; 13.10 and 11.20 for both male and female birds, respectively. These findings show that sexual dimorphism exists in all morphometric traits in favour of the male, with BW being the most dimorphic. The research will also aid in the selection of Gallus gallus domesticus for improved meat production and will address the issue of sex discrimination during mating selection before sexual maturity.
Author (S) Details
Hannah Edim Etta
Biological Sciences Department, Cross River University of Technology, Calabar, Cross River State, Nigeria.
Kogbara, Henry Barizigakol
Department of Genetics and Biotechnology, University of Calabar, Calabar, Cross River State, Nigeria.
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