Sherif Ibrahim Ahmed Ramadan
Dept. Head
Estimation of Gentic and Phenotypic Parameters for some Productive and Reproductive Traits in Egyptian Buffoloes
Benha Journal of Applied Sciences • 2017
Publication Information
Authors
Z.H.S.Abo-Gamil
,Kh.M.El-Bayomi
,M.E.S.Abo-Salem
,ShI.Ramadan
, S.A.Darwish
,
E.A.Sallam
,E.A.Manaa
Keywords
Dairy buffalo, Productive and reproductive traits, Heritability, Genetic and phenotypic correlation,
Breeding values
Journal
Benha Journal of Applied Sciences
Publisher
Not Available
Volume
2
Issue
3
Pages
53-59
publication.type
Local
Paper Link
Open Link
Supplementary Materials
Not Available
Abstract
The present study aimed to display effects of age at first services, age at first calving (AFC), calving interval,
days open, number of services per conception, days dry, season of calving on total milk yield (TMY) and 305
milk yield (305MY). Also, to estimate effect of season and parity on calving interval (CI) and days open and
then the effect of level of production on service per conception, age at first service, age at first calving, calving
interval and days open. Heritability estimates for 305-day milk yield (0.18), days open (0.18), dry period (DP)
(0.12), TMY (0.17) and CI (0.19). High heritability estimates were obtained for AFC (0.68) and lactation length
(LL) (0.78). There were high positive genetic and phenotypic correlations between total milk yield and 305-day
milk yield and low genetic and phenotypic correlations between most studied traits. Average EBV for AFS, AFC
and 305MY were higher in cow than sire and dam. Also, average EBV for LL and DO were higher in sire than in
cow and dam and average EBV for CI and DP were higher in dam than in cow and sire. But TMY was equal in
sire and dam and higher than cow.
days open, number of services per conception, days dry, season of calving on total milk yield (TMY) and 305
milk yield (305MY). Also, to estimate effect of season and parity on calving interval (CI) and days open and
then the effect of level of production on service per conception, age at first service, age at first calving, calving
interval and days open. Heritability estimates for 305-day milk yield (0.18), days open (0.18), dry period (DP)
(0.12), TMY (0.17) and CI (0.19). High heritability estimates were obtained for AFC (0.68) and lactation length
(LL) (0.78). There were high positive genetic and phenotypic correlations between total milk yield and 305-day
milk yield and low genetic and phenotypic correlations between most studied traits. Average EBV for AFS, AFC
and 305MY were higher in cow than sire and dam. Also, average EBV for LL and DO were higher in sire than in
cow and dam and average EBV for CI and DP were higher in dam than in cow and sire. But TMY was equal in
sire and dam and higher than cow.