OJGen  Vol.3 No.4 , December 2013
Effects of coat colour genes on body measurements, heat tolerance traits and haematological parameters in West African Dwarf sheep
ABSTRACT

With 178 West African Dwarf sheep aged 1 to 3 years, a study was conducted to investigate the effects of coat colour genes on body measurements, heat tolerance traits and haematological parameters. Body measurements considered included body length, hair length, ear length, hip width, tail length, height at withers, rump height, fore cannon bone length, chest depth, heart girth and body weight. Heat tolerance traits considered were skin temperature, rectal temperature, pulse rate and respiratory rate. Blood samples were collected for the evaluation of white blood cell (WBC), red blood cell (RBC), haemoglobin (HGB), haematocrit (HCT), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin cell (MCHC), red cell distribution width (RDW), platelets (PLT), mean platelets volume (MPV), platelets distribution width (PDW) and plateletcrits (PCT). Results showed that coat colour gene (CCG) had significant (P < 0.01) effect on rump height and tail length. Animals with black (BB) coat colour had the highest mean value for rump height (57.80 ± 1.29 cm) and tail length (22.10 ± 0.89 cm), while brown (Bb) coat colour had the least value of 53.00 ± 6.00 cm for rump height and 17.50 ± 0.50 cm for tail length. The CCG had significant (P < 0.01) effect on body temperature and pulse rate, with the grey/mouflon (Ag) colour possessing the highest body temperature (38.90°C ± 0.22°C), and Bb having the least value of 37.20°C ± 0.35°C. White/tan (Awt) had the highest pulse rate of 28.90 ± 0.66 beats/min and Bb had the least value of 20.00 ± 2.00 beats/min. The CCG had significant (P < 0.01) effect on RBC and MPV with brown (Bb) colour having the highest RBC counts (18.20 ± 0.00 L) and badgerface (Ab) having the least value (11.50 ± 0.62 L). The Bb had the highest value (5.60 ± 0.00 fL) for MPV and Ab had the least value (4.70 ± 0.15 fL). Sheep with Bb and Ab were found to withstand heat stress better than others.


Cite this paper
Decampos, J. , Ikeobi, C. , Olowofeso, O. , Smith, O. , Adeleke, M. , Wheto, M. , Ogunlakin, D. , A. Mohammed, A. , Sanni, T. , Ogunfuye, B. , Lawal, R. , Adenaike, A. and Amusan, S. (2013) Effects of coat colour genes on body measurements, heat tolerance traits and haematological parameters in West African Dwarf sheep. Open Journal of Genetics, 3, 280-284. doi: 10.4236/ojgen.2013.34031.
References
[1]   Martojo, H. (1992) Genetic improvement in livestock. PAU IPB, Bogor, 1-20.

[2]   Odubote, I.K. (1994) Influence of qualitative traits on the performance of West African Dwarf goats. Nigerian Journal of Animal Production, 21, 25-28.

[3]   Ebozoje, M.O. and Ikeobi, C.O.N. (1998) Colour variation and reproduction in West African Dwarf goats. Small Ruminant Research, 27, 125-130.
http://dx.doi.org/10.1016/S0921-4488(97)00045-X

[4]   Yakubu, A., Kuje, D. and Okpeku, M. (2010) Principal components as measure of size and shape in Nigerian indigenous chickens. Thai Journal of Agricultural Science, 42, 167-176.

[5]   Afolayan, R.A., Adeyinka, I.A. and Lakpini, C.A.M. (2006) The estimation of live weight from body measurements of Yankassa sheep. African Journal of Biomedical Research, 5, 81-82.

[6]   Brown, J.E., Brown, C.J. and Butts, W.T. (1973) Evaluating relationships among immature measures of size, shape and performance on beef bulls I: Principal component as measures of size and shape in young Hereford and Angus bulls. Journal of Animal Science, 36, 1010-1020.

[7]   Essien, A. and Adesope, O.M. (2003) Linear body measurements of N’dama calves at 12 months in a Southwestern zone of Nigeria. Livestock Research for Rural Development, 15, 4.

[8]   Blackmore, D.W., McGulliard, L.D. and Lush, J.L. (1958) Genetic relationship between body measurements at three ages in Holstein. Journal of Dairy Science, 41, 1045-1049. http://dx.doi.org/10.3168/jds.S0022-0302(58)91048-8

[9]   Ibe, S.N. and Ezekwe, A.G. (1994) Quantifying size and shape difference between Muturu and N’dama breeds of cattle. Nigerian Journal of Animal Production, 21, 51-58.

[10]   Chineke, C.A. (2000) Characterization of physical body traits of domestic rabbit in humid tropics. Proceedings of the 25th Annual Conference of Nigerian Society for Animal Production, March 2000, Umudike, 237-238.

[11]   Susan, C. (2010) University of Maryland Extension, Solution in your community. http://www.sheepandgoat.com/

[12]   Maraia, I.F.M., El-Darawanya, A.A., Fadiel, M.A.M. and Abdel-Hafez, M.A. (2005) Physiological traits as affected by heat stress in sheep. Indian Journal of Animal Health, 42, 20-21.

[13]   Stenesh, J. (1975) Dictionary of Biochemistry. Wiley-Interscience Publication, London, 137.

[14]   Gong, Y.F., Lu, X., Wang, Z.P., Hu, F., Luo, Y.R., Cai, S.Q., Qi, C.M., Li, S., Niu, X.Y., Qiu, X.T., Zeng, J. and Zhang, Q. (2010) Detection of quantitative trait loci affecting haematological traits in swine via genome scanning. BMC Genetics, 11, 56-57.
http://dx.doi.org/10.1186/1471-2156-11-56

[15]   Muhammad, N.O., Oloyede, O.B., Owoyele, B.V. and Olajide, J.E. (2004) Deleterious effect of defatted Terminalia catappa seed meal-based diet on haematological and urinary parameters of albino rats. NISEB Journal, 4, 51-57.

[16]   Kakade, M.L., Simons, N.R., Liener, I.E. and Lambert, J.W. (1972) Biochemical and nutritional assessment of different varieties of soybean. Journal of Agriculture and Food Chemistry, 20, 87-90.
http://dx.doi.org/10.1021/jf60179a024

[17]   Butswat, I.S., Mbap, S.T. and Ayibantoye, G.A. (2000) Heat tolerance of sheep in Bauchi. Nigerian Tropical Agriculture, 77, 265-268.

[18]   Alul, J.S., Ashok, S. and Klirn, F.H. (1995) Effect of haemoglobin types on reproductive tracts in Jersey cattle. Indian Veterinary Journal, 12, 642-644.

[19]   Ryder, M.L. (1980) Fleece colour in sheep and its inheritance. Animal Breeding Abstract, CAB, 48, 305-322.

[20]   SAS. (1999) SAS User’s Guide. Version 8.1, SAS Institute Inc., Cary.

[21]   Gomez, A.K. and Gomez, A.A. (1984) Statistical procedure for agricultural research. 2nd Edition, John Wiley and Sons Inc., New York, 680.

[22]   Arp, S.C., Owens, F.N., Armbruster, S.L.V. and Scott, L. (1982) Relationships of coat colour, body surface temperature and respiration rate in feedlot steers. Oklahoma Agricultural Experimental Station.

[23]   Hutchinson, J.C.D., Brown, G.D. and Allen, T.E. (1976) The effects of solar radiation on the sensible heat exchange of mammals. In: Johnson, H.J., ed., Progress in Animals Biometeorology, 42.

[24]   Sanusi, A.O. (2012) Effects of coat colour genes on heat stress and tolerance to Haemonchus contortus among West African Dwarf sheep. M. Agric. Dissertation, Federal University of Agriculture, Abeokuta.

[25]   Borges, S.A., Ariki, J. and Cummings, K.R. (2003) Dietary electrolyte balance for broiler chickens exposed to thermo-neutral and heat stress environments. Poultry Science, 82, 428-435.

 
 
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