Some Genetic and Phenotypic Parameters in Navajo and Navajo Crossbred Yearling Ewes

Phenotypic and Genetic Parameters for Fleece Weight and some Wool Quality Traits

“…(1954) and Battie (1962) report a heritability of 0.57 which is close t o the regression estimate given in Table 10. Hall et al (1964) estimating the heritability of fibre diameter of Navajo & Navajo crossbred yearling ewes give figures similar to the intraclass correlation estimates. Indrebo (1954) and SkHrman (1944) found, however, higher values namely 0.78 and 0.61-0.86, respectively.…”

Genetic and environmental factors of sheep under arid conditions

“…However, the values found in this study are in good agreement with those showed by Morley (1951) and Kyle and Terrill (1953) who used the same method employed in this work. All other values that were found in the literature are considerably higher, such as those given by Terrill and Hazel (19^3), Morley (1951Morley ( , 1955, MacNaughton (1956), Young et (I960) and Hall et al (1964).…”

“…In another set of data involving h years and analyzed within each year, males weighed between ,42 and .97 pounds more than females and single lambs were between 1.^9 and 2.21 pounds heavier than twins. Sidwell et al (1964), in an extensive study of ^331…”

“…(1953) .35 Karakul 207 dam-offspring pairs Yao et al (1953) .25 Karakul Regression on mid-parent Yao ^ al, (1953) .33 h breeds 1632 dam-offspring pairs Blackwell and Henderson (1955) .09 Suffolk Regression of off spring on dam . The maternal and nutritional effects on body weight may also Hall ^ al. (1964) .30 to .42 Pohle and Keller (1943) .…”

Genetic and economic factors in sheep production

“…Diverse environments were associated with the variety of genetic correlations presented in Table 1. Data used as a basis for the estimates from the Western Sheep Breeding Laboratory (19^6), Srcanbrack (195%), Morley (1950Morley ( ), (1955, Madsen (1958) and Hall (1964) were from sheep kept under strictly range conditions where supplemental feeding was • absent or kept to a minimum. Data used as a basis in the remainder of the studies came from sheep kept under farm flock conditions or a combination of range and feedlot con ditions.…”