Lecture 3-22 Exam 3 Breeds FineMediumCoarse Most important breeds? Why so many in US?

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Presentation transcript:

Lecture 3-22 Exam 3 Breeds FineMediumCoarse Most important breeds? Why so many in US?

Performance Records Purebred Operations: More records required Registration work Traits important to breed

Genetic Improvement: 3 factors 1. Selection differential 2. Heritability 3. Generation interval

Selection Differential SD is the superiority of replacements compared to flock average. Example: Average adjusted WW 60 Replacement Ewes - 70 Replacement Ewes = 10 x.5 x.2 SD = 1.0

Replacement Ram = 85 pound adj. ww = 25 x.5 x.2 SD = 2.5 Total SD = = 3.5

Limits to Selection Differential n Sires provide more improvement n SD with only one trait n More traits - SD per trait decreases

Heritability % of what you see which is due to genetics. Traits h 2 Reproduction Growth Carcass Wool.4 -.6

Low h 2 traits require multiple records Example: Lambs born h with r <.20 Repeatability - likelihood that a ewe twinning in 2011 will twin in Lamb crop in U.S. has not increased. Number born increases with ewe age

Selection based on one record must account for fixed effects. Ex: 5 year old ewe with twins in 2011 Individual record not important. Perspective buyers What has she done relative to flock average each of past five years

Wool traits highly heritable highly repeatable one record of performance

Generation Interval How fast the flock turns over. GI = Average Ewe + Average Ram Age = 3.0 2

GI - Smallest possible = 1 Economic suicide Why ?? Best Solution = let ewe age float Rams use only one year Use older rams from other flocks

Economic Traits Ewes: Pounds Weaned Mothering ability Milking ability Prolificacy Growth Hardiness and Longevity Extended Breeding Season Clean Wool

Economic Traits Rams: Offspring Vigor and Livability Rate of Gain Feed Efficiency Breeding Capacity Carcass Cutability Lambing Ease

Genetic Improvement Set Selection Goals Identify Superior Individuals NSIP - uses all performance records - fair comparisons via contemporary groups - provides genetic estimates on animals without records ex. rams and young lambs

NSIP Traits Maternal Lambs born Pounds Weaned Maternal Milk Growth60, 120, 365 WoolGrease Fleece Weight (GFW) Fleece Length Fleece Grade

Fixed Effects Adjust for: Dam Age Type of Birth and Rearing Age Adjustment Sex

Contemporary groups What is it? When are they needed?

Other Sheep Improvement Plans n Lamb Plan n Wool Plan n Ewe Byte n Group Breeding Schemes u Great Britain SUFFOLK SIRE REFERENCE SCHEME SUFFOLK SIRE REFERENCE SCHEME u Canada Western Suffolk Sire Reference program Ontario Suffolk Sire Refernece program Why is group breeding successful.

Why does sheep industry not embrace genetic improvement? Purebred breeders Commercial producers