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Titolo:
Effects of density on perching behavior of broiler chickens
Autore:
Pettit-Riley, R; Estevez, I;
Indirizzi:
Univ Maryland, Dept Anim & Avian Sci, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 Avian Sci, College Pk, MD 20742 USA
Titolo Testata:
APPLIED ANIMAL BEHAVIOUR SCIENCE
fascicolo: 2, volume: 71, anno: 2001,
pagine: 127 - 140
SICI:
0168-1591(20010220)71:2<127:EODOPB>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAYING HENS; CAGES; WELFARE;
Keywords:
perching behavior; density; broilers;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Estevez, I Univ Maryland, Dept Anim & Avian Sci, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 College Pk, MD 20742 USA
Citazione:
R. Pettit-Riley e I. Estevez, "Effects of density on perching behavior of broiler chickens", APPL ANIM B, 71(2), 2001, pp. 127-140

Abstract

Exercise through perching has been suggested as a way to reduce the impactof leg problems in broiler chickens. It is possible that higher stocking densities may motivate birds to perch more, and perhaps reduce some of the detrimental effects to broiler health seen with high stocking densities. Thegoal of this research was to investigate the effects of density (10, 15, and 20 birds/m(2)) and perch design on the frequency of perch utilization. Mixed sex broilers were assigned to 36 pens in a four perch treatment x three density factorial with three replications for each treatment/density combination in a randomized complete block design. Pens were assigned to one offour perch treatments: control (no perches), horizontal (three horizontal perches), angled (three 10 degrees angled perches), or mixed angle (one horizontal, one 10 degrees angled, and one 20 degrees angled perch), at each of the three densities. The results show that although the frequency of perch use was low, (2.6% +/- 0.15), significant preferences were clear. Perching frequency was significantly higher when birds were raised at stocking densities of 15 (2.88 +/- 0.303) or 20 birds/m(2) (2.76 +/- 0.211), as opposedto 10 birds/m(2) (2.10 +/- 0.209) as indicated by a marginally significantmain effect (p < 0.0597), and a significant linear effect (P < 0.0427). The birds used the horizontal perches the most, followed by 10 degrees angledand mixed angle perch treatments with decreasing frequency. An effect of age was found, in that perching increased during the first 3 weeks, and dropped off significantly at the end of the rearing period for all perch treatments. In general, perches closest to the hallway or outside of the house were used more than perches in the middle of the pen. Preferential use of thehighest section of the 10 degrees angled perches was also found. The applied perch treatments or densities did not significantly affect final body weight or feed conversion. Percent mortality due to heat stress showed a significant increase with density, while mortality not caused by heat stress did not change with perch treatment or density. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 22:47:58