PMID- 6436219
OWN - NLM
STAT- MEDLINE
DCOM- 19841205
LR  - 20190511
IS  - 0021-8812 (Print)
IS  - 0021-8812 (Linking)
VI  - 59
IP  - 3
DP  - 1984 Sep
TI  - The effect of selection in retrospect on lifetime production efficiency in sheep.
PG  - 620-9
AB  - Within 32 crossbred group-management system-birth year subgroups, "selection in 
      retrospect" was practiced based upon several ewe lamb traits, singly or in 
      combination, to assess what the effect of such selection would have been on ewe 
      lifetime production efficiency. Ewes were from two birth years, eight crossbred 
      groups and two management systems. Ewe's type of birth, date of birth, actual and 
      adjusted weaning weight (WWt and AWWt), postweaning weight (PWWt) and first yr 
      gross income (FGROS) were the ewe lamb traits involved in the single trait paper 
      selection schemes. Only the ewe lamb weights (WWt, AWWt and PWWt) caused a 
      significant increase in the production efficiency of selected populations over 
      those of the corresponding unselected populations. When postweaning weight was 
      used jointly with the ewe's type of birth in an independent culling level 
      selection scheme, both the group composed of heavier multiple-born ewes and the 
      group composed primarily of single-born ewes were more productive than the group 
      composed of lighter weight multiple-born ewes. Backward selection of the elite 
      ewes having the best production efficiency also showed that the heavier the ewe 
      lamb, the more efficient she was expected to be. Examination of ewes surviving 
      the entire duration of the experiment failed to identify any early life trait 
      that predicted longevity. Furthermore, surviving ewes were equally variable in 
      their early life traits to the populations at large. Longevity, however, was 
      positively related to lifetime efficiency.
FAU - Saoud, N B
AU  - Saoud NB
FAU - Hohenboken, W D
AU  - Hohenboken WD
LA  - eng
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  - Animal Husbandry/*economics
MH  - Animals
MH  - Body Weight
MH  - Cost-Benefit Analysis
MH  - Crosses, Genetic
MH  - Female
MH  - Parity
MH  - *Reproduction
MH  - Selection, Genetic
MH  - Sheep/*genetics/physiology
MH  - Weaning
EDAT- 1984/09/01 00:00
MHDA- 1984/09/01 00:01
CRDT- 1984/09/01 00:00
PHST- 1984/09/01 00:00 [pubmed]
PHST- 1984/09/01 00:01 [medline]
PHST- 1984/09/01 00:00 [entrez]
AID - 10.2527/jas1984.593620x [doi]
PST - ppublish
SO  - J Anim Sci. 1984 Sep;59(3):620-9. doi: 10.2527/jas1984.593620x.