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Iowa State University (1965)

Genetic and environmental factors of sheep under arid conditions

Eltawil Esam Abdelsalam

Titre : Genetic and environmental factors of sheep under arid conditions

Auteur : Eltawil Esam Abdelsalam

Université de soutenance : Iowa State University

Grade : Doctor of Philosophy 1965

Descriptif
The Navajo sheep studied here have evolved under condi tions that are inferior to farm and other range conditions in the United States, They have developed characteristics for adaptability to harsh environments, fertility and mothering ability which may be of value if transmitted to other breeds of sheep. A vast area of the world lies in arid circumstances and the inhabitants lack animal protein. The sheep breeding project at the Southwestern Range and Sheep Breeding Labora tory at Fort Wingate, New Mexico, may provide ideas and experience, as well as animals, which will be useful in many parts of the world. One of the main purposes of this study was to investi gate the relative importance of the environmental factors on the production of sheep under these arid conditions. The second,, main purpose was to measure the genetic and phenotypic parameters that are concerned with lamb and wool production so that breeding programs can be developed to achieve maximum progress from selection.

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Page publiée le 16 novembre 2014, mise à jour le 22 décembre 2018