Journal of Applied and Natural Science 3(1):20-24(2011)
Assessment of long-term production traits of three breeds of exotic commercial layers in the derived Savannah zone of Nigeria
S. O. Olawumi1 * and I. Dudusola 2
1 Animal Breeding Unit, Department of Animal Production and Health Sciences, University of Ado-Ekiti, P. M. B. 5363, Ado-Ekiti, NIGERIA
2 Department of Animal Science, Obafemi Awolowo University, Ile-Ife, NIGERIA
Abstract : This study was carried out to compare production traits of three breeds of exotic commercial layers for a production period of 15 months. The breeds are Isa Brown (IB), Bovan Nera (BN) and Dominant Black (DB) and the traits considered are hen-day egg production, feed efficiency and mortality rate. The general means are 5.24eggs/bird/week, 0.006/bird/week and 0.16/breed/week for egg production, feed efficiency and mortality rate, respectively. There was highly significant (P<0.01) effect of breed on egg production and feed efficiency but the reverse was the case for mortality rate. On egg production, IB genotype recorded 5.37+0.07 eggs/bird/week while BN breed had 5.41+0.08 eggs/bird/week and the values were similar but superior to DB genotype with 4.94eggs/bird/week. For feed efficiency, IB and BN breeds recorded higher mean values and were similar but superior to DB genotype. The mean values are: IB=0.006+9.05x10-5 , BN=0.006+8.53x10 -5 and DB=0.005/bird/week. Breed’s effect on mortality rate showed that the three genotypes had similar values, that is, breed has no significant (P>0.05) effect on this trait. There was highly significant (P<0.01) effect of age of birds on egg production. Age 2 (2 nd month) recorded the highest mean values while age 14 (14th month) was the lowest. The values respectively, are 6.04+0.16 eggs/bird/week and 4.18+0.16 eggs/bird/week. In addition, there was highly significant (P<0.01) effect of age of birds on feed efficiency regardless of the breed of birds. Age 2 (2 nd month) recorded the highest mean values and age 14 (14 th month) the lowest. There was also highly significant (P<0.01) effect of age on mortality rate of commercial layers. The long-term production analyses showed that IB and BN genotypes are more productive, feed efficient and could be recommended to farmers as commercially viable breeds of layers.
Keywords : Breed, Trait, Egg production, Age, Mortality