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Titolo:
Aging and improving reproductive success in horses: declining residual reproductive value or just older and wiser?
Autore:
Cameron, EZ; Linklater, WL; Stafford, KJ; Minot, EO;
Indirizzi:
Massey Univ, Inst Nat Resources, Ecol Grp, Palmerston North, New Zealand Massey Univ Palmerston North New Zealand Palmerston North, New Zealand Massey Univ, Inst Vet Anim & Biomed Sci, Palmerston North, New Zealand Massey Univ Palmerston North New Zealand Palmerston North, New Zealand
Titolo Testata:
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
fascicolo: 4, volume: 47, anno: 2000,
pagine: 243 - 249
SICI:
0340-5443(200003)47:4<243:AAIRSI>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
AGE-SPECIFIC REPRODUCTION; SUCKLING BEHAVIOR; NURSING BEHAVIOR; EQUUS-CABALLUS; BIGHORN SHEEP; MATERNAL AGE; MILK INTAKE; INVESTMENT; LACTATION; MONKEYS;
Keywords:
maternal investment; Equidae; Equus caballus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Cameron, EZ Massey Univ, Inst Nat Resources, Ecol Grp, Private Bag 11-222,Palmerston North, New Zealand Massey Univ Private Bag 11-222 Palmerston North New Zealand
Citazione:
E.Z. Cameron et al., "Aging and improving reproductive success in horses: declining residual reproductive value or just older and wiser?", BEHAV ECO S, 47(4), 2000, pp. 243-249

Abstract

In many mammalian species, female success in raising offspring improves asthey age. The residual reproductive value hypothesis predicts that each individual offspring will be more valuable to the mother as she ages because there is less conflict between the current and potential future offspring. Therefore, as mothers age, their investment into individual offspring should increase. Empirical evidence for an influence of declining residual reproductive value on maternal investment is unconvincing. Older mothers may notinvest more, but may be more successful due to greater experience, allowing them to target their investment more appropriately (targeted reproductiveeffort hypothesis). Most studies do not preclude either hypothesis. Mare age significantly influenced maternal investment in feral horses living on the North Island of New Zealand. Older mares, that were more successful at raising foals, were more protective for the first 20 days of life, but less diligent thereafter. Total maternal input by older mothers did not seem to be any greater, but was better targeted at the most critical period for foal survival and a similar pattern was observed in mares that had lost a foalin the previous year. In addition, older mothers were more likely to foal in consecutive years, supporting the hypothesis that they are investing less than younger mares in individual offspring. Therefore, older mothers seemto become more successful by targeting their investment better due to experience, not by investing more in their offspring.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 12:37:47