Influence of Age and Body Condition on Semen Quality, Testicular and Body Dimensions in Red Sokoto Goats of Two Hair Types.

Description

– Influence of Age and Body Condition on Semen Quality, Testicular and Body Dimensions in Red Sokoto Goats of Two Hair Types –

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Abstract

The study was conducted (July, 2011 – June, 2012) to determine the influence of age and body condition on semen quality, testicular and body dimensions in Red Sokoto goats of two hair types using 31 Red Sokoto bucks. The ages of the bucks were categorized into four; 9 -12, 13-16, 17-20 and 21-24 months.

The hair types were categorized into short- smooth (SS) and long-curly (LC). The body condition was scored and categorized as score 3 and 4. Weight records and linear body measurements were obtained.

Testicular length and testicular circumference were measured using flexible tape while testicular width and testicular weight were estimated using the appropriate formulae. The semen trait, sperm morphological defects and semen cation concentrations were evaluated accordingly.

The results showed that the mean BW, HG, ST, CW, WH, BD, BL, RW, TL, TC, TW and TWT were 15.02 Kg, 59.9 cm, 54.95 cm, 8.37 cm, 53.41 cm, 32.86 cm, 57.35 cm, 17.03 cm, 12.00 cm, 17.38 cm, 5.53 cm and 203.04 g; while 0.52, 0.64, 0.52, 1.03, 0.61, 94.90,m67.79, 2.62, 5.42 were for DMT, MPD, DH, CBT, ACR, Na, K, Ca and PO_4, respectively.

Semen volume, sperm motility, semen pH, sperm concentration and live & dead ratio  were 0.42 ml, 79.52 %, 8.85, 701.13 x 10⁶/ml and 0.82 %, respectively. Age and BCS significantly (P<0.01) influenced BW, body conformation and testicular traits, but had a variable influence on semen traits.

DMT, MPD and CBT were more frequent in younger- matured bucks of between 13 and 20 months of age than bucks of later ages while DH and ACR occurred in the younger (9 – 12 months) and older bucks (21 – 24 months of age).

Semen cation concentrations were relatively higher in the older bucks of 21 – 24 months than the younger bucks except for Na⁺ which was also high in younger bucks of 9 – 16 months. Hair type had influence (P<0.01) on some testicular traits.

Introduction

1.1 Background of the Study

Livestock of different species fulfill different functions in the household economy and poor families often keep a diversity of species for this reason (Anderson, 2003).

Domestic goats (Capra hircus, L.) are important and adaptable domesticated animals (Abdel-Aziz, 2010). They provide a full range of useful products to humans including meat, milk, skin and hair.

They efficiently survive on available shrubs and trees in harsh environment and in low fertility lands where no other crops can be grown in Nigeria.

Goat production over the years has been one of the major means of improving the livelihoods of poor livestock keepers, reducing poverty and attaining sustainable agriculture and universal food security (Abdel-Aziz, 2010).

The population of goats in Nigeria is estimated at 53.8 million (FAOSTAT, 2011) of which traditionally reared stock contributes 99.97%, while 0.03% of the stock is commercially managed.

Based on morphology, the two most important goat breeds traditionally recognized in Nigeria are the Red Sokoto (RS) and the West African Dwarf (WAD) goats (Ebozoje and Ikeobi, 1998).

In order to develop a very good model for the genetic improvement of goats, it is important to measure the traits of interest with some high level of accuracy. Since goats are mostly kept for their meat, the most important trait of interest for genetic improvement is the body weight.

Body weight is often the most common and informative measure of animal performance (Adeyinka and Mohammed, 2006).

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