Crossbreeding parameters and variance components were estimated for lactation and reproductive traits of crosses between the Sahiwal, Brown Swiss and Ayrshire breeds in a dairy herd in sub-humid coastal Kenya. An individual animal model was fitted to the data with a fixed effect for 20 distinct b...
Mackinnon, M.J.
,
Thorpe, W.R.
,
Baker, R.L.
,
[Sources of genetic variation for milk production in a crossbred herd in the tropics]
,
Sources of genetic variation for milk production in a crossbred herd in the tropics
Resistance to nematode parasites can be improved by selection, but efforts to include appropriate traits in commercial livestock breeding programs are only a recent development. Procedures for including resistance in breeding programs are similar to those involving other traits. The steps are des...
Woolaston, R.R.
,
Baker, R.L.
,
[Prospects of breeding small ruminants for resistance to internal parasites]
,
Prospects of breeding small ruminants for resistance to internal parasites
The survival rates of Dorper, Red Maasai and crossbred lambs born over a period of 6 years at Diani Estate, Coast Province, Kenya were compared using the Cox mixed proportional hazards model with a random (frailty) term for sire. Of the 1785 lambs born, proportionately 0.44 died before they were ...
Nguti, R.
,
Janssen, P.
,
Rowlands, G.J.
,
Audho, James O.
,
Baker, R.L.
,
[Survival of Red Maasai, Dorper and crossbred lambs in the sub-humid tropics]
,
Survival of Red Maasai, Dorper and crossbred lambs in the sub-humid tropics
A total of 1443 records were used to estimate individual and maternal additive genetic breed and heterotic effects for preweaning growth and survival traits of crosses of Ayrshire (A), Brown Swiss (B), and Sahiwal (S) in a dairy herd in the lowland coastal tropics of Kenya. Individual and matern...
Kahi, A.K.
,
Mackinnon, M.J.
,
Thorpe, W.R.
,
Baker, R.L.
,
Njubi, D.
,
[Estimation of individual and maternal additive genetic and heterotic effects for preweaning traits of crosses of Ayrshire, Brown Swiss and Sahiwal cattle in the lowland tropics of Kenya]
,
Estimation of individual and maternal additive genetic and heterotic effects for preweaning traits of crosses of Ayrshire, Brown Swiss and Sahiwal cattle in the lowland tropics of Kenya
Breeding objectives were developed for meat sheep in smallholder production circumstances in the tropics. The traits considered were litter size, lambing frequency, pre-weaning, and post-weaning lamb survival to 12 months, ewe survival, lamb live weight at 12-month, mature ewe live weight, consum...
Kosgey, I.S.
,
Arendonk, Johan A.M. van
,
Baker, R.L.
,
[Economic values for traits of meat sheep in medium to high production potential areas of the tropics]
,
Economic values for traits of meat sheep in medium to high production potential areas of the tropics
Crossbreeding parameters for milk production and reproductive traits and for cow live weight (LW) of crosses of Ayrshire (A), Brown Swiss (B), Friesian (F) and Sahiwal (S) cattle were estimated using data from a dairy herd in the lowland coastal tropics of Kenya. An individual animal model was fi...
Kahi, A.K.
,
Thorpe, W.R.
,
Nitter, G.
,
Baker, R.L.
,
[Crossbreeding for dairy production in the lowland tropics of Kenya. I. Estimation of individual crossbreeding effects on milk production and reproductive traits and on cow live weight]
,
Crossbreeding for dairy production in the lowland tropics of Kenya. I. Estimation of individual crossbreeding effects on milk production and reproductive traits and on cow live weight
The evidence for both between-and within-breed genetic variation for resistance to gastrointestinal (GI) nematode parasites is reviewed. It is concluded that much of the published research on breed characterisation for resistance suffers from poor experimental design. Prior to the initiation of a...
Baker, R.L.
,
[Genetic resistance to endoparasites in sheep and goats. A review of genetic resistance to gastrointestinal nematode parasites in sheep and goats in the tropics and evidence for resistance in some sheep and goat breeds in sub-humid coastal Kenya]
,
Genetic resistance to endoparasites in sheep and goats. A review of genetic resistance to gastrointestinal nematode parasites in sheep and goats in the tropics and evidence for resistance in some sheep and goat breeds in sub-humid coastal Kenya
Resistance and resilience to naturally acquired gastro-intestinal (GI) nematode parasite infections (predominantly Haemonchus contortus) were studied in 1785 lambs born over six lambings (1991 to 1996) consisting of 212 Red Maasai, 311 Dorper and 1262 crossbred (Red Maasai-Dorper) lambs in the su...
Baker, R.L.
,
Nagda, S.M.
,
Rodríguez Zas, S.L.
,
Southey, B.R.
,
Audho, James O.
,
Aduda, Eric O.
,
Thorpe, W.R.
,
[Resistance and resilience to gastro-intestinal nematode parasites and relationships with productivity of Red Maasai, Dorper and Red Maasai X Dorper crossbred lambs in the sub-humid tropics]
,
Resistance and resilience to gastro-intestinal nematode parasites and relationships with productivity of Red Maasai, Dorper and Red Maasai X Dorper crossbred lambs in the sub-humid tropics