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Economic values for production traits (carrier, fat, protein, and dressing percentage) and functional traits (conception rate, survival rate, body weight, and rumen capacity) were calculated for Holstein cattle of Costa Rica. Economic values were derived using a bio-economic model that combined g...


Vargas, B.Groen, A.F.Herrero, Mario T.Arendonk, Johan A.M. van[Economic values for production and functional traits in Holstein cattle of Costa Rica]Economic values for production and functional traits in Holstein cattle of Costa Rica

A study was carried out to test: (1) if the prediction of in vitro gas production of kikuyu grass (Pennisetum clandestinum) samples by near-infrared reflectance spectroscopy (NIRS) could be improved by the use of a spectrally-structured sample population; and (2) if the parameters from exponentia...


Herrero, Mario T.Jessop, N.S.Fawcett, R.H.Murray, I.Dent, J.B.[Prediction of the in vitro gas production dynamics of kikuyu grass by near-infrared reflectance spectroscopy using spectrally-structured sample populations]Prediction of the in vitro gas production dynamics of kikuyu grass by near-infrared reflectance spectroscopy using spectrally-structured sample populations

Evaluation of lifetime productivity is sensible to target interventions for improving productivity of smallholder dairy systems in the highlands of East Africa, because cows are normally not disposed of based on productive reasons. Feeding strategies and involuntary culling may have long-term eff...


Rufino, Mariana C.Herrero, Mario T.Wijk, Mark T. vanHemerink, L.Ridder, N.A. deGiller, Ken E.[Lifetime productivity of dairy cows in smallholder farming systems of the Central highlands of Kenya]Lifetime productivity of dairy cows in smallholder farming systems of the Central highlands of Kenya

A dynamic performance model was integrated with a model that optimised culling and insemination policies in dairy herds using dynamic programming. The performance model estimated daily feed intake, milk yield and body weight change of dairy cows on the basis of availability and quality of feed an...


Vargas, B.Herrero, Mario T.Arendonk, Johan A.M. van[Interactions between optimal replacement policies and feeding strategies in dairy herds]Interactions between optimal replacement policies and feeding strategies in dairy herds

Estimates of global greenhouse gases (GHG) emissions attributable to livestock range from 8 to 51%. This variability creates confusion among policy makers and the public as it suggests that there is a lack of consensus among scientists with regard to the contribution of livestock to global GHG em...


Herrero, Mario T.Gerber, Pierre J.Vellinga, T.Garnett, TaraLeip, A.Opio, C.Westhoek, H.J.Thornton, Philip K.Olesen, J.E.Hutchings, N.Montgomery, H.Soussana, J.F.Steinfeld, H.McAllister, T.A.[Livestock and greenhouse gas emissions: The importance of getting the numbers right]Livestock and greenhouse gas emissions: The importance of getting the numbers right

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