Conception, lambing rate and litter size were studied on data from a flock of Horro sheep in Ethiopia from 1878 to 1997. The CATMOD and GLM procedures of SAS were used for the analysis of these traits. A sire, direct additive genetic and a repeatability animal model were employed to obtain estim...
Abegaz, S.
,
Duguma, G.
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Negussie, E.
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Gelmesa, U.
,
Terefe, F.
,
Rege, J.E.O.
,
[Factors affecting reproductive performance and estimates of genetic parameters of litter size in Horro sheep]
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Factors affecting reproductive performance and estimates of genetic parameters of litter size in Horro sheep
Ewe reproduction and productivity were studied in the highlands of Ethiopia in Horro and Menz ewes mated to lamb in both the wet and dry seasons from June 1992 to May 1997. The data included a total of 4890 mating records of which 2516 were Menz ewes and 2374 Horro ewes, with 2360 matings in the ...
Mukasa-Mugerwa, E.
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Anindo, D.O.
,
Sovani, S.
,
Lahlou-Kassi, A.
,
Tembely, S.
,
Rege, J.E.O.
,
Baker, R.L.
,
[Reproductive performance and productivity of Menz and Horro sheep lambing in the wet and dry seasons in the highlands of Ethiopia]
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Reproductive performance and productivity of Menz and Horro sheep lambing in the wet and dry seasons in the highlands of Ethiopia
An on-farm study was conducted over a 12-year period (1979 through 1990) at four locations in the subhumid zone of Nigeria to estimate levels of performance of Bunaji cattle and to examine factors affecting productivity in these production systems. Average weight at birth, at 9 months and at 12 m...
A study was conducted to estimate heritabilities of, and genetic correlations among, body weight (WT) and testicular measurements - scrotal circumference (SC), testicular diameter (TD), testicular length (TL) and epididymal diameter (ED - in ram lambs between 6, 9 and 12 months old, and relations...
Toe, F.
,
Rege, J.E.O.
,
Mukasa-Mugerwa, E.
,
Tembely, S.
,
Anindo, D.O.
,
Baker, R.L.
,
Lahlou-Kassi, A.
,
[Reproductive characteristics of Ethiopian highland sheeI. Genetic parameters of testicular measurements in ram lambs and relationship with age at puberty in ewe lambs]
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Reproductive characteristics of Ethiopian highland sheeI. Genetic parameters of testicular measurements in ram lambs and relationship with age at puberty in ewe lambs
A study was conducted to investigate the effect of season on, and to estimate heritabilities of, and genetic correlations among, semen and spermatozoa characteristics and the relationship of these characteristics with measures of testicular or scrotal size in 6-, 9- and 12-month old ram lambs of ...
Rege, J.E.O.
,
Toe, F.
,
Mukasa-Mugerwa, E.
,
Tembely, S.
,
Anindo, D.O.
,
Baker, R.L.
,
Lahlou-Kassi, A.
,
[Reproductive characteristics of Ethiopian highland sheep. II. Genetic parameters of semen characteristics and their relationships with testicular measurements in ram lambs]
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Reproductive characteristics of Ethiopian highland sheep. II. Genetic parameters of semen characteristics and their relationships with testicular measurements in ram lambs
Calving date (CD) records of 68896 polled Hereford dams of 120 682 calves were coded within herd-year-season with date 1 being the date the first calf was born. Factors affecting CD and its relationship with production traits were investigated. Early calving was found to be associated with high p...
Rege, J.E.O.
,
Famula, T.R.
,
[Factors affecting calving date and its relationship with production traits of Hereford dams]
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Factors affecting calving date and its relationship with production traits of Hereford dams
On-station characterisation of indigenous Menz (n = 1639) and Horro (n = 1135) sheep of Ethiopia in the central highlands of the country was undertaken between 1992 and 1997 at the Debre Berhan Research Station of the International Livestock Research Institute (ILRI) to study the phenotypic chara...
Tibbo, Markos
,
Ayalew, W.
,
Awgichew, K.
,
Ermias, E.
,
Rege, J.E.O.
,
[On-station characterisation of indigenous Menz and Horro sheep breeds in the central highlands of Ethiopia]
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On-station characterisation of indigenous Menz and Horro sheep breeds in the central highlands of Ethiopia
Phenotypeic and genetic trends of calving interval (CI), nine months corrected weaning weight (9MOWT) and calf weight, weaned/cow/year (cow index), were estimated on data from three ranches (Mogwooni, Galana and Oljorai) located in semi arid areas of Kenya. The number of records per herd varied b...
A total of 26,233 calving records from three commercial ranches: Mogwooni, Galana and O'ljorai; located in high altitude, humid and low altitude, coastal, and medium altitude rangelands of Kenya, were available for the study over periods between 10 and 30 years. The traits studied were: age at fi...
Okeyo Mwai, Ally
,
Mosi, R.O.
,
Rege, J.E.O.
,
[Genetic and phenotypic parameters and trends of reproduction traits in Kenya Boran cows]
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Genetic and phenotypic parameters and trends of reproduction traits in Kenya Boran cows
A study was conducted to estimate heritabilities of, and genetic correlations among, body weight (WT) and testicular measurements - scrotal circumference (SC), testicular diameter (TD), testicular length (TL) and epididymal diameter (ED - in ram lambs between 6, 9 and 12 months old, and relations...
Toe, F.
,
Rege, J.E.O.
,
Mukasa-Mugerwa, E.
,
Tembely, S.
,
Anindo, D.O.
,
Baker, R.L.
,
Lahlou-Kassi, A.
,
[Reproductive characteristics of Ethiopian highland sheep. I. Genetic parameters of testicular measurements in ram lambs and relationship with age at puberty in ewe lambs]
,
Reproductive characteristics of Ethiopian highland sheep. I. Genetic parameters of testicular measurements in ram lambs and relationship with age at puberty in ewe lambs