Crop Weights Used to Adjust Body Weights of Live Spruce Grouse

Comeau, Roxanne; Keppie, Daniel M.

doi:10.2307/3809218

The Journal of Wildlife Management

1989

DOI: 10.2307/3809218

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Crop Weights Used to Adjust Body Weights of Live Spruce Grouse

Roxanne Comeau¹,

Daniel M. Keppie²

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2012

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“…The food ingestion rate has been estimated in captivity as 300-500 g ⁄ day (Batty et al 2006), representing about 20% of chick body mass. This extra mass may affect estimations of body condition (Amat et al 2007), so reliable ways to estimate the quantity of food inside a crop are necessary (Comeau & Keppie 1988). In addition, the digestion rate of food in the crop of Flamingo chicks is not known, nor are the factors that may affect it.…”

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Crop size as an index of chick provisioning in the Greater FlamingoPhoenicopterus roseus

Rendón

Garrido

Guerrero³

et al. 2012

Ibis

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After being fed by their parents, Greater Flamingo chicks store food in their crops, which protrude outwards. We allocated the crop profiles of chicks to four categories to assess the relationship between body mass and crop profile variation, and so determine whether crop size can be used as an accurate index of the amount of food ingested, and to determine the timing and frequency of provisioning. We registered changes in body mass and crop fullness in eight chicks captured with turgid crops and kept in captivity until constant mass was achieved. The meal mass ingested by the chicks during each parental feeding was around 18% of net chick mass and varied greatly with crop profile. Mean transition times between the four crop profile categories ranged from 6 to 14 h. Between 1998 and 2009, 34% of chicks caught for ringing in a breeding colony had empty crops. From crop profiles recorded during the handling of chicks, it was estimated that approximately one‐third of the chicks were fed in the evening and another third during the night. Our results have implications for the estimation of body condition indexes because body mass should be free of the influence of the mass of the food in the crop.

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“…It then becomes necessary to rely on indirect measures to estimate the quantity of food ingested by chicks. Crop size is one such indirect measure of the amount of food consumed by chicks (Collopy 1986, Westmoreland & Best 1987, Blockstein 1989) and by adults (Houston & Houston 1976, Comeau & Keppie 1988, Smith 1990, 1991).…”

mentioning

confidence: 99%

Crop size as an index of chick provisioning in the Greater FlamingoPhoenicopterus roseus

Rendón

Garrido

Guerrero³

et al. 2012

Ibis

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Crop Weights Used to Adjust Body Weights of Live Spruce Grouse

Cited by 1 publication

References 0 publications

Crop size as an index of chick provisioning in the Greater FlamingoPhoenicopterus roseus

Crop size as an index of chick provisioning in the Greater FlamingoPhoenicopterus roseus

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