Selection for eight-week body weight in two randombred chicken populations under altered water to feed ratios. 1. Selection responses.

dc.contributor.author	Marks, HL	en
dc.date.accessioned	2014-06-06T06:42:34Z
dc.date.available	2014-06-06T06:42:34Z
dc.date.issued	1994	en
dc.identifier.issn	00325791	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/688
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0028488814&partnerID=40&md5=8ee3a5e049ce9d0af84e95e7c2e5c982	en
dc.subject.other	water	en
dc.subject.other	age	en
dc.subject.other	animal	en
dc.subject.other	article	en
dc.subject.other	body weight	en
dc.subject.other	chicken	en
dc.subject.other	eating	en
dc.subject.other	egg laying	en
dc.subject.other	female	en
dc.subject.other	genetic selection	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	reproduction	en
dc.subject.other	salt intake	en
dc.subject.other	Age Factors	en
dc.subject.other	Animal	en
dc.subject.other	Body Weight	en
dc.subject.other	Chickens	en
dc.subject.other	Eating	en
dc.subject.other	Female	en
dc.subject.other	Male	en
dc.subject.other	Oviposition	en
dc.subject.other	Reproduction	en
dc.subject.other	Selection (Genetics)	en
dc.subject.other	Sodium Chloride, Dietary	en
dc.subject.other	Water	en
dc.title	Selection for eight-week body weight in two randombred chicken populations under altered water to feed ratios. 1. Selection responses.	en
heal.type	journalArticle	en
heal.publicationDate	1994	en
heal.abstract	A study was conducted to investigate the response to selection for 8-wk BW under selection environments that utilized different dietary salt levels to alter water to feed ratios. The Athens-Canadian (AC) and Athens Randombreds (ARB) served as base populations. A broiler diet consisting of 23% CP and 3,120 kcal of ME/kg was modified to contain .2, .4, and 1.6% dietary salt. Chicks from the AC and ARB populations were divided within full-sib families into three groups, with one group assigned to each of the three dietary salt selection environments. Individual phenotypic selection was conducted within the six lines for high 8-wk BW for six generations with unselected randombred controls included in each generation to measure environmental variation. No differences in 8-wk BW were observed among the three salt selection environments. Lines derived from the ARB population were initially approximately 75 g larger than those derived from the AC population. However, when BW were expressed as percentage deviation from the control in the sixth generation, selection response patterns were similar (AC lines, 28 to 32%; ARB lines, 32 to 36%). These data indicated that selection for 8-wk BW was as effective under high- and low-salt diets as under a normal-salt diet. Realized heritabilities, following correction for environmental variation, ranged from .38 to .46. Failure to correct for environmental variation resulted in large fluctuations in heritabilities across generations. These data provide strong support for inclusion of controls to accurately measure the heritability of BW in selection studies.	en
heal.journalName	Poultry science	en
dc.identifier.issue	8	en
dc.identifier.volume	73	en
dc.identifier.spage	1175	en
dc.identifier.epage	1182	en