EFFECT OF CROSSING BETWEEN LOHMAN SELECTED LEGHORN WITH TWO DEVELEPED STRAINS OF CHICKENS FOR IMPROVING SOME EGG PRODUCTION TRAITS | ||||
| Egyptian Poultry Science Journal | ||||
| Article 17, Volume 37, Issue 4, December 2017, Page 1261-1271 PDF (441.86 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/epsj.2017.5652 | ||||
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| Abstract | ||||
| The objective of this study was improving egg production traits in two developed local strains of chickens by crossing.Two developed strains of chickens, Matrouh (MT) and Silver Montazah (SM) were used as sire lines and a commercial strain Lohman Selected Leghorn (LSL) was used as a dam line to produce five genotypes, three pure lines and two crosses, SMXLSL and MTXLSL. Age (ASM) and body weight (BWSM) at sexual maturity were recorded individually. Egg number (EN) and egg weight (EW) during different periods of production were recorded and egg mass production (EM) was calculated. Heteroses percentage (H%) also, were estimated the different studied traits. Estimates of phenotypic correlation coefficients between egg number during the 1st 90 day of laying and some egg production traits were estimated. Results showed that: 1- The pure lines matured significantly earlier (175.65d)than the two way cross (186.03d), while BWSM had insignificant difference between the pure and the cross groups. 2- The two-way cross SMXLSL produced significantly (P≤ 0.01) higher EN and EM than MTXLSL cross for all studied periods. 3- Estimates of H% for ASM and BWSM were positive and high for SMXLSL cross (4.55% and 9.52%), respectively, and 2.98% and 4.35% for MTXLSL crossbred, respectively, while it was negative (-15.89 and -15.54%) for EN during the 1st 90 day of laying for SMXLSL and MTXLSL crossbred, respectively. 4- Positive and high H% were found for both of the SMXLSL and MTXLSL crossbred for EM during the last two studied periods (EM2 and EM3),while negative H% was found for EM1 in the same crosses. These results indicated that the two-way cross improved the annual egg mass production by 26.03% and 37.66% for both of SMXLSL and MTXLSL crosses, respectively. 5- The phenotypic correlation between the annual egg production record and the partial record was low for the developed strains, while, it was high for the commercial one (LSL). Also, it was high for the two- way crosses. Generally, these results indicate that crossing between LSL and /or Matrouh, Silver Montazah strains improved egg production traits. Mating Silver Montazah sire line with LSL dam line improved egg number and egg mass production at the different studied periods compared to the other cross. | ||||
| Keywords | ||||
| Crossing; egg production traits – heterosis; correlation | ||||
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