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aberrant horns alleles animals average biological value body weight breeding ewes carrier cash value characters cell Chapter chromosomes clean wool weight commercial breeder considered crimps per inch cryptorchid cryptorchism Cunnamulla Deniliquin Diff dominant gene effect environment environmental ewes joined example expected fibre diameter gametes gene frequency genetic correlation genotype greasy fleece weight greasy wool half-poll heritability heterozygous homozygous hybrid vigour important individual sheep lambs born lambs weaned main flocks major gene Mating Type medium Peppin Merino Medium wool Merino breeder Merino ewes Merino ram non-Peppin number of lambs offspring outbreeding pair Peppin Merinos percentage phenotypes pigmentation Poll Merino polled rams polledness progeny rams rams and ewes random mating ratio recessive gene reference flock relationship result scur Section segregation selection differential sire groups skin wrinkle sperm staple length strain stud breeder style groups Table Topmakers Trangie twins two-tooth variation weaners wethers wool cut wool production Wrinkle Score