Crossbreeding to Improve Productivity ASI Young Entrepreneur Meeting. David R. Notter Department of Animal and Poultry Sciences Virginia Tech
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1 Crossbreeding to Improve Productivity ASI Young Entrepreneur Meeting David R. Notter Department of Animal and Poultry Sciences Virginia Tech Denver, CO Jan. 27,
2 The Evolution of Modern Animal Breeding Purebred sires (1950s) Performance recording and ram tests (1950s and 1960s) Structured crossbreeding (1960s) New breed introductions (1970s) EPDs (1980s) Genomics (21 st Century) 2
3 The Evolution of Modern Animal Breeding Purebred sires (1950s) Performance recording and ram tests (1950s and 1960s) Structured crossbreeding (1960s) New breed introductions (1970s) EPDs / EBVs (1980s) Genomics (21 st Century) INTEGRATION OF THE TOOLS 3
4 The Evolution of Modern Animal Breeding Purebred sires (1950s) Performance recording and ram tests (1950s and 1960s) Structured crossbreeding (1960s) New breed introductions (1970s) EPDs / EBVs (1980s) Genomics (21 st Century) INTEGRATION OF THE TOOLS (Still Waiting!) 4
5 The History of Western Range Sheep is a History of Crossbreeding 5
6 Columbia ( ) The need: Larger, heavier lambs The approach: Cross fine-wool ewes with long-wool rams Today: Lots of emphasis on size Continued emphasis on wool White-faced Terminal Sire breed Used to increase ewe size for heavy-lamb production 6
7 Large-Framed Lincoln Ram 7
8 8
9 Columbia ( ) The need: Larger, heavier lambs The approach: Cross fine-wool ewes with long-wool rams Today: Lots of emphasis on size Continued emphasis on wool White-faced Terminal Sire breed Used to increase ewe size for heavy-lamb production 9
10 Targhee ( ) The need: Stabilize the long-wool contribution at ~25% Create a true dual-purpose meat-wool ewe breed The approach: Crosses of Rambouillet, Corriedale, Lincoln, & Columbia Today: Dual-purpose meat-wool breed Moderate size 10
11 Polypay ( ) The need: Greater lamb production potential Higher prolificacy & enhanced out-of-season breeding Acceptable fleeces and good carcasses The approach: Cross Rambouillet, Targhee, Finnsheep and Dorset Today: Mostly used in Midwest intensive and semi-intensive production 11 Popular in accelerated lambing programs
12 Katahdin ( ) The need: Easy-care ewe type Climate adaptation for warm, humid parts of the country Parasite resistance & no shearing The approach: Cross temperate wool and Caribbean hair breeds (Suffolk, Virgin Island White, Wiltshire Horn) Fecal egg count EBVs 12 Today: One of the fastest growing US breeds
13 Siremax ( ) The need: High-fitness, high-performance terminal-sire breed Lean growth, commercial fitness, and longevity Selection based on objective performance records The approach: Cross Suffolk, Columbia, Texel, and Hampshire Select for growth and loin eye area using EBVs Today: Increasingly popular as a crossbreed terminal-sire breed 13
14 Leaders in Performance-Based Genetic Improvement Targhee Polypay Western Range Index Polypay Ewe Productivity Index Katahdin Katahdin Ewe Productivity Index Siremax Carcass Plus Lean Growth Index Limited involvement in NSIP 14
15 Other Sheep Composites Various other Suffolk-Columbia-Texel- Hampshire composites Tamarack Prolific (uses the Booroola gene) Rafter 7 Composite (Australian Merino- Rambouillet) US MARC Composites: Composites I, II, and III (all gone now) Easy-Care Composite ( 50% Romanov, 25% White Dorper and 25% Katahdin) 15
16 WHY Crossbreed??? To Optimize Gene Frequencies Mix strengths of different breeds to create something that is needed but may not currently exit Allows focus on Maternal Traits in the ewe flock and Growth and Carcass Value in the sires. To Utilize Heterosis Important, positive effects on performance in both the crossbred lamb and the crossbred ewe. 16
17 Average Heterosis in Crossbred Lambs Trait Level of heterosis (%) Birth weight 3.2 Weaning weight 5.0 Postweaning daily gain 6.6 Yearling weight 5.2 Conception rate 2.6 Prolificacy (litter size) of the dam 2.8 Survival, birth to weaning 9.8 Carcass traits ~ 0 Lambs born per ewe exposed 5.3 Lambs weaned per ewe exposed 15.2 Weight of lamb weaned per ewe exposed
18 Average Heterosis the Crossbred Ewes Trait Level of heterosis (%) Fertility 8.7 Prolificacy (litter size) 3.2 Postweaning daily gain 6.6 Ewe body weight 5.0 Fleece weight 5.0 Lamb birth weight 5.1 Lamb weaning weight 6.3 Lamb survival, birth to weaning 2.7 Lambs born per ewe exposed 11.5 Lambs weaned per ewe exposed 14.7 Weight of lamb weaned per ewe exposed 18.0 Cumulative Heterosis from Crossbred Lamb and Crossbred Ewe Weight of lamb weaned per ewe exposed 39.0% 18
19 Average Heterosis in Crossbred Lambs Trait Level of heterosis (%) Birth weight 3.2 Weaning weight 5.0 Postweaning daily gain 6.6 Yearling weight 5.2 Conception rate 2.6 Prolificacy (litter size) of the dam 2.8 Survival, birth to weaning Up to 9.8 Carcass traits ~ 0 Lambs born per ewe exposed 5.3 Lambs weaned per ewe exposed 15.2 Weight of lamb weaned per ewe exposed
20 Average Heterosis the Crossbred Ewes Trait Level of heterosis (%) Fertility 3.0 Prolificacy (litter size) 3.2 Postweaning daily gain 6.6 Ewe body weight 5.0 Fleece weight 5.0 Lamb birth weight 5.1 Lamb weaning weight 5.0 Lamb survival, birth to weaning 2.7 Lambs born per ewe exposed 11.5 Lambs weaned per ewe exposed 14.7 Weight of lamb weaned per ewe exposed 11.0 Cumulative Heterosis from Crossbred Lamb and Crossbred Ewe Weight of lamb weaned per ewe exposed 28.0% 20
21 Three-Breed Cross Targhee x Merino (for example) crossbred ewes x Terminal Sire rams 3-way cross market lambs (all go to market) 1) Maximum heterosis in ewe and lamb 2) Optimal adaptation to a range environment in the ewe 3) Enhance growth, carcass merit, and value of the crossbred lamb 21
22 Three-Breed Cross Purchased Merino rams (for example) Targhee ewes (for example) x Targhee rams (to produce replacements) Targhee x Merino crossbred ewes x Purchased Terminal Sire rams 3-way cross market lambs (all go to market) 22
23 Three-Breed Cross Breeding group 1 (~10% of ewes) Purchased Merino rams (for example) Breeding group 2 (~ 30% of ewes) Targhee ewes (for example) x Targhee rams (to produce replacements) Targhee x Merino crossbred ewes Breeding group 3 (~ 60% of ewes) x Purchased Terminal Sire rams 3-way cross market lambs (all go to market) 23
24 24
25 Terminal Cross Well-adapted white-faced Western range ewes X Purchased Terminal Sire rams 3-way cross market lambs (all go to market) 25
26
27 USSES Terminal Sire Breed Evaluation Cycle 1 Columbia Composite Suffolk Texel Rambouillet F 1 Progeny
28 Terminal Sire Breed Evaluation Cycle 2 Suffolk Siremax USSES Composite Rambouillet Targhee Polypay F 1 Progeny
29 Terminal Cross Well-adapted whitefaced Western range ewes Rambouillet Targhee Merino Polypay Mutton Merino Columbia 29
30 Using Breed Resources to Design Crossbred Ewes Well-adapted whitefaced Western range ewes Rambouillet Targhee Merino ( fiber diameter) Polypay ( lamb drop) Mutton Merino Columbia ( wts of finished lambs) 30
31 Returns over feed costs as a % of the base flock for 1 additive SD change in each trait in Targhee sheep 108 WW = weaning wt FW = fleece wt MM = maternal WW FD = fiber diameter YW = yearling wt SL = staple length PLC = % lamb crop born 106 Relative returns, % WW MM YW FW FD SL PLC Selection criterion High feed costs Low feed costs
32 Effects of flock prolificacy on weight of lamb weaned 55 Weight of lamb weaned, kg/ewe High triplet survival Low triplet survival Flock prolificacy, lambs born per ewe lambing
33 Average litter size of adult (4- through 6-yr-old) ewes lambing between 1992 and 2016 Western Range Index Mean Litter Size
34 WHY Develop New Breed??? To Optimize Gene Frequencies Mix strengths of different breeds to create something that is needed but does not currently exit To Utilize Heterosis Without maintaining several breeds and using structured crossing Composites can be managed just like pure breeds 34
35 Using Breed Resources to Design Crossbred Ewes Year Need Breed 0 Targhee 1 Finer fleeces Rambouillet 2 Finer fleeces Rambouillet 3 More lambs Polypay 4 Size Columbia 5 Finer fleeces Merino/Merino cross 6 Moderate size Targhee 7 Moderate size Targhee 35
36
37 Lambs Born per Ewe Exposed Pounds of Lambs Weaned per Ewe Exposed (+15%) (+15%) Lambs Born per Ewe Lambing 37
38 Cumulative (4-year) Number of Lambs Produced Cumulative (4-year) Weight of Lamb Weaned (+24%) (+31%) 38
39 Lambs Born per Ewe Exposed Pounds of Lambs Weaned per Ewe Exposed (+15%) +(15%) (24%) (+15%) Lambs Born per Ewe Lambing 39
40 Cumulative (4-year) Number of Lambs Born Cumulative (4-year) Weight of Lamb Weaned (24%) (55%) (+24%) (+31%) 40
41 Using Breed Resources to Design Crossbred Ewes Year Need Breed 0 Targhee 1 Finer fleeces Rambouillet 2 Finer fleeces Rambouillet 3 More lambs Polypay 4 Size Columbia 5 Finer fleeces Merino/Merino cross 6 Moderate size Targhee 7 Moderate size Targhee Making it work: 1) Reliable, performance based source flocks for all breeds 2) A reasonable knowledge of the breed effects on economically important traits 3) Some capacity to evaluate performance in commercial ewes (at least by sire breed) 4) Rigorous ewe culling on performance (at least wet vs. dry and no. born) 41
42 The Evolution of Modern Animal Breeding Purebred sires (1950s) Performance recording and ram tests (1950s and 1960s) Structured crossbreeding (1960s) New breed introductions (1970s) EPDs / EBVs (1980s) Genomics (21 st Century) INTEGRATION OF THE TOOLS (Still Waiting!) 42
43 187,500 replacement ewe lambs per year The Genetic Improvement Pyramid 6,250 rams with EBVs Maternal breeds 7,250 lambings 312,500 ewes in Multiplier flocks No EBVs Supports 750,000 to 1 million breeding ewes in Commercial flocks Elite Nucleus Flocks with EBVs
44 The Genetic Improvement Pyramid 37,000 rams from Multiplier flocks 610 rams with EBVs Terminal Sires 2,500 lambings 30,500 ewes in Multiplier flocks No EBVs 2 million breeding ewes in Commercial flocks bred to Terminal Sires Elite Nucleus Flocks with EBVs 2,440 rams with EBVs
45 Leaders in Performance-Based Genetic Improvement Targhee Polypay Western Range Index Columbia Polypay Ewe Productivity Index Limited involvement in NSIP Challenged to find a common vision for the breed 45
46 46
47 47
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