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Titolo:
Birth weight variation in the domestic pig: effects on offspring survival,weight gain and suckling behaviour
Autore:
Milligan, BN; Fraser, D; Kramer, DL;
Indirizzi:
McGill Univ, Dept Biol, Montreal, PQ H3A 1B1, Canada McGill Univ MontrealPQ Canada H3A 1B1 Biol, Montreal, PQ H3A 1B1, Canada Univ British Columbia, Fac Agr Sci, Anim Welfare Program, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada Univ British Columbia, Ctr Appl Eth, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada
Titolo Testata:
APPLIED ANIMAL BEHAVIOUR SCIENCE
fascicolo: 3, volume: 73, anno: 2001,
pagine: 179 - 191
SICI:
0168-1591(20010801)73:3<179:BWVITD>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLUE-FOOTED BOOBY; HATCHING ASYNCHRONY; SIBLING AGGRESSION; SEQUENTIAL ASSESSMENT; BROOD REDUCTION; MILK-PRODUCTION; CATTLE EGRETS; TEAT ORDER; MORTALITY; SOWS;
Keywords:
competition; pig; suckling; survival; variation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Milligan, BN 252 Stone Rd W,Unit 85, Guelph, ON N1G 2V7, Canada 252 StoneRd W,Unit 85 Guelph ON Canada N1G 2V7 2V7, Canada
Citazione:
B.N. Milligan et al., "Birth weight variation in the domestic pig: effects on offspring survival,weight gain and suckling behaviour", APPL ANIM B, 73(3), 2001, pp. 179-191

Abstract

In domestic pigs, litter-mates often vary considerably in birth weight. Toexamine whether this size variation influences piglet survival, weight gain and suckling behaviour, we experimentally manipulated the number and sizedistribution of litter-mates in 51 litters. Litters were small (eight or nine piglets) or large (11 or 12 piglets) compared to the herd mean of 10 piglets, and were made more or less variable in weight by using the largest and smallest quartiles of two combined litters (variable) or the middle two quartiles (uniform). Weights were measured on days 0, 3 and 21. Behaviouralmeasures (percent of nursings missed, mean teat consistency score, per capita number of teat disputes before milk ejection, and percent time spent inteat disputes in the 20 min after milk ejection) were recorded on days 1, 4, 10 and 17. Piglet weight variation (percent of coefficient of variation,CV) almost doubled over the 21 days in uniform litters and actually decreased in variable litters, but still remained higher in the variable litters. Overall, survival, percent of nursings missed, consistency in piglets' useof teats, number of teat disputes, percent time a piglet spent in teat disputes after milk ejection, and weight gain were unaffected by birth weight variation although there was a tendency (P = 0.09) for more piglet deaths in variable litters. Behavioural measures of sibling competition were higherin large litters. The data provide little support for the hypotheses that high birth weight variation results in decreased survival, or that it permits rapid establishment of dominance, thereby reducing wasteful competitive behaviour in surviving piglets. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 27/09/20 alle ore 13:13:23