PMID- 2592274
OWN - NLM
STAT- MEDLINE
DCOM- 19900123
LR  - 20190510
IS  - 0021-8812 (Print)
IS  - 0021-8812 (Linking)
VI  - 67
IP  - 11
DP  - 1989 Nov
TI  - Multiple ovulation and embryo manipulation in the improvement of beef cattle: 
      relative theoretical rates of genetic change.
PG  - 2863-71
AB  - Theoretical rates of annual genetic responses to selection in beef cattle were 
      compared for conventional and multiple ovulation and embryo transfer (MOET) 
      breeding schemes. Several combinations of replacement policy, mating ratio and 
      type of selection were considered for both schemes with low, medium and high 
      heritabilities. For MOET, four rates of embryo transfers per donor were used to 
      represent low to moderate MOET levels. The results indicated that annual genetic 
      responses to selection could be up to 1.3, 1.6 and 1.8 times as great for MOET 
      compared with conventional breeding for traits of low, medium and high 
      heritability, respectively; however, the annual inbreeding rates also were high 
      for the MOET schemes considered. Embryo splitting, or cloning, was shown to 
      increase accuracy of selection by 8 to 35% through the production of identical 
      genotypes. The use of MOET in conjunction with embryo splitting in elite nucleus 
      units could substantially increase genetic improvement for traits with low, 
      medium and high heritabilities in beef cattle populations.
FAU - Gearheart, W W
AU  - Gearheart WW
AD  - Dept. of Anim. and Poult. Sci., University of Guelph, Ontario, Canada.
FAU - Smith, C
AU  - Smith C
FAU - Teepker, G
AU  - Teepker G
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Anim Sci
JT  - Journal of animal science
JID - 8003002
SB  - IM
MH  - Animals
MH  - Breeding/*methods
MH  - Cattle/*genetics/physiology
MH  - *Embryo Transfer
MH  - Female
MH  - Male
MH  - Models, Genetic
MH  - Ovulation/*genetics
MH  - Pregnancy
MH  - Superovulation/*genetics
EDAT- 1989/11/01 00:00
MHDA- 1989/11/01 00:01
CRDT- 1989/11/01 00:00
PHST- 1989/11/01 00:00 [pubmed]
PHST- 1989/11/01 00:01 [medline]
PHST- 1989/11/01 00:00 [entrez]
AID - 10.2527/jas1989.67112863x [doi]
PST - ppublish
SO  - J Anim Sci. 1989 Nov;67(11):2863-71. doi: 10.2527/jas1989.67112863x.