Studies on Sexual Dimorphism in a Cross River Ecotype Local Chicken – Rose Comb (Gallus gallus domesticus) | Chapter 4 | Recent Research Advances in Biology Vol. 12

 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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Spiders Biodiversity and Recording of Nesticodes rufipes from Suburban Area of South Bengaluru Karnataka | Chapter 14 | Recent Research Advances in Biology Vol. 1

 

In the current study the spider’s biodiversity was surveyed, the findings of Theridiid spider Nesticodes

rufipes was recorded and documented from the suburban area of Turahalli forest, south Bangalore

Karnataka. The samples were collected, during the monsoon season as the richness of species were

encountered. Totally 11 families with 18 different species were documented and identified. Some of

the common spiders observed were signature spiders, orb web spider, garden spiny spider. Orb

weaver spider, decorative silver orb web spider, red house spider, Indian ornamental tarantula, funnel

web spider, yellow sac spider black wood spider, giant wood spider, golden lynyx spider, jumping

spider, grass crab spider, and white kneed spider. Among the 18 species, Araneidae family had

recorded highest species (05) with 27.7%, the families Nephilidae, Oxyopidae and Salticidae(02each)

had recorded with 11.11%. The other seven families had documented with (01 each) 5.55%. The

male and female spiders were found and recorded for the most dominant species. The Oxoypes

species had documented the highest number of males (15) with 37.5%. Whereas the greater number

of females had found for Argiope anasuja (25) with 18.65%. The Simpsons Diversity Index (SDI) was

0.92, indicating the high richness in the species diversity. From the study area Nesticodes rufipes was

identified and reported. The morphology of N. rufipes is very similar to that described by Saaristo

(1978) of Seychelles Finland. However, the morphometric analysis of male and female spider differed

both in size & body coloration, which might be due to geographical variations.

 

Author (s) Details

 

S. Jalajakshi

Genetics Department, Vijaya College, Basavanagudi, Bangalore, India.

A. Usha Raja Nanthini

Biotechnology Department, Mother Teresa Women’s University, Kodaikanal, India.

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