CHAPTER IV.

IMPROVEMENT OF THE BREEDS.

(63) Introductory remarks;--(64) Early Improvers of the Sheep;--(65) Modern Breeders and Improvements;--(66) Varieties among Animals, how induced;--(67) Varieties induced by temperature;--(68) Adaptation of the Sheep to climate;--(69) Changes produced by climate;--(70) Temperature preferred by Sheep;--(71) Extent of the alterations produced by climate;--(72) Increase in the number of the Horns;--(73) Causes of the various forms of the Horn;--(74) The proper temperature required for Sheep;--(75) Geographical limits of the Sheep;--(76) Particular forms induced by geographical limit;--(77) Influence of vegetation on form and disposition;--(78) Breeds required for Britain--(79) Varied nature of the food of Sheep;--(80) Influence of food on the quality of Mutton;--(81) Differences in the quality of Mutton;--(82) Abuses in Feeding;--(83) Tendency to acquire Fat;--(84) Frequent change of Pasture necessary;--(85) Varieties induced by apparently trivial causes;--(86) Varieties from mode of Breeding; --(87) Breeding _in_ and _in_;--(88) Opponents of _in_ and _in_ Breeding;--(89) Breeding from different families of the same race;--(90) Crossing;--(91) Things to be attended to in Crossing; --(92) Choice of Parents;--(93) Influence of Sex;--(94) Method of obtaining a greater number of one Sex, at the option of the Proprietor 67