Divergent selection for growth in Japanese quail under split and complete nutritional environments. 8. Progress from generations 18 through 30 following change of selection criterion.

dc.contributor.author	Marks, HL	en
dc.date.accessioned	2014-06-06T06:42:46Z
dc.date.available	2014-06-06T06:42:46Z
dc.date.issued	1995	en
dc.identifier.issn	00325791	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/802
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0029246547&partnerID=40&md5=fb970bb98012ef252e1eb067e6f43a19	en
dc.subject.other	animal	en
dc.subject.other	animal husbandry	en
dc.subject.other	article	en
dc.subject.other	body weight	en
dc.subject.other	Coturnix	en
dc.subject.other	diet	en
dc.subject.other	female	en
dc.subject.other	genetic selection	en
dc.subject.other	genetic variability	en
dc.subject.other	genetics	en
dc.subject.other	growth, development and aging	en
dc.subject.other	male	en
dc.subject.other	physiology	en
dc.subject.other	species difference	en
dc.subject.other	time	en
dc.subject.other	weight gain	en
dc.subject.other	Animal	en
dc.subject.other	Animal Husbandry	en
dc.subject.other	Body Weight	en
dc.subject.other	Coturnix	en
dc.subject.other	Diet	en
dc.subject.other	Female	en
dc.subject.other	Male	en
dc.subject.other	Selection (Genetics)	en
dc.subject.other	Species Specificity	en
dc.subject.other	Time Factors	en
dc.subject.other	Variation (Genetics)	en
dc.subject.other	Weight Gain	en
dc.title	Divergent selection for growth in Japanese quail under split and complete nutritional environments. 8. Progress from generations 18 through 30 following change of selection criterion.	en
heal.type	journalArticle	en
heal.publicationDate	1995	en
heal.abstract	Following 17 generations of divergent selection for 4-wk BW under split- (SD) and complete- (CD) diet environments, two sublines were established from high (H-SD and H-CD) BW lines. Subline H-SDG derived from the H-SD line was selected for BW gain from 2 to 4 wk under the SD environment, whereas Subline H-CDG derived from the H-CD line was similarly selected under the CD environment. These two sublines were maintained and reproduced simultaneously with H-SD, L-SD, H-CD, L-CD lines from Generation 18 through 30. The purpose of changing the selection criterion was to investigate genetic variation in BW gain independent of changes that occur immediately following hatch. Selection progress and heritabilities (approximately .3) in BW lines (H-SD, H-CD, and L-SD) were similar from Generation 18 through 30. However, progress and heritability (approximately .1) was not as great in the L-CD line. These responses indicate that considerable additive genetic variation for 4-wk BW remains in these lines. Selection for increased BW gain from 2 to 4 wk in both sublines (H-SDG and H-CDG) resulted in smaller BW at 2 wk of age than did selection for 4-wk BW. Under the SD environment, H-SDG quail were smaller at 4 wk than H-SD quail following 12 generations of selection, whereas under the CD environment, H-CDG quail were larger than H-CD quail. Results indicate that selection for BW gain was more effective under the CD than SD environment and that the lack of improvement in 2-wk BW accompanying the increase in BW gain may adversely influence the potential benefits obtainable from selection for gain.	en
heal.journalName	Poultry science	en
dc.identifier.issue	2	en
dc.identifier.volume	74	en
dc.identifier.spage	237	en
dc.identifier.epage	246	en