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Source : DANS

Feeding and management strategies for rural poultry production in Central Tanzania

Goromela, E.H. (2009)

Keywords: Central Tanzania, rural poultry, scavengeable feed resources, nutrient composition, crop contents, season, farming system, chemical composition, supplementary feeding, weaning, egg production, growth rate, survival rate, laying management, indigenous chickens The main objective of the ...

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Source : DANS

Effect of photoperiod on body weight gain, and daily energy intake and energy expenditure in Japanese quail (Coturnix c. Japonica)

Boon, P et al. (2000)

Effect of photoperiod and food duration on body weight gain, energy intake, energy expenditure, and sexual development were investigated in two strains of Japanese quail (Coturnix c. japonica), bred for meat (broilers) or egg production (layers), from 7 to 71 days of age. In a first experiment ...

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Source : DANS

Natural and human-induced predation on Cape Cormorants at Dyer Island

Voorbergen, A. et al. (2012)

To develop conservation strategies for vulnerable seabird species that need attention, it is important to know which factors influence their breeding productivity. Predation of eggs and chicks can have large influences on seabird reproduction, especially when human disturbance facilitates predation. ...

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Source : DANS

Unpredictable environments lead to the evolution of parental neglect in birds

Caro, Shana M. et al. (2016)

A nest of begging chicks invites an intuitive explanation: needy chicks want to be fed and parents want to feed them. Surprisingly, however, in a quarter of species studied, parents ignore begging chicks. Furthermore, parents in some species even neglect smaller chicks that beg more, and ...

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Source : DANS

Parental food provisioning is related to nestling stress response in wild great tit nestlings: implications for the development of personality

Oers, van, K. et al. (2015)

Background Variation in early nutrition is known to play an important role in shaping the behavioural development of individuals. Parental prey selection may have long-lasting behavioural influences. In birds foraging on arthropods, for instance, the specific prey types, e.g. spiders and ...

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Source : DANS

Fathers with highly demanding partners and offspring in a semi-desert environment: energetic aspects of the breeding system of Monteiro's Hornbills (Tockus monteiri) in Namibia

Klaassen, M.R.J. et al. (2003)

Molting females of Monteiro's Hornbills (Tockus monteiri) seal themselves in nest cavities to breed until chicks are about half grown. To gain insight into the chronology of energy requirements of the Monteiro's Hornbill family unit in relation to this peculiar breeding strategy, we measured a ...

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Source : DANS

Brood size and immunity costs in zebra finches Taeniopygia guttata

Verhulst, S et al. (janv. 2005)

Birds rearing experimentally enlarged broods have lower antibody responses to a novel antigen, and we tested three hypotheses that could explain this result. We used zebra finches Taeniopygia guttata inoculated with sheep red blood cells (SRBC) as a study system, for which this trade-off was ...

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Source : DANS

The hormonal control of begging and early aggressive behavior: Experiments in black-headed gull chicks

Groothuis, TGG et al. (août 2005)

The hormonal control of begging and sibling competition is largely unknown, but recent evidence suggests a role for steroid hormones. We tested the influence of the aromatizable androgen testosterone (T), the non-aromatizable androgen 5 alpha-dihydrotestosterone (DHT), and 17 beta-estradiol (E) on ...

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