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2006, Number 3

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Vet Mex 2006; 37 (3)

Feed intake, cause and percentage of mortality in commercial poultry farms under the climatic conditions of the state of Yucatan, Mexico

Ortiz MFI, García CL, Castro AFJ

Language: English/Spanish
References: 22
Page: 379-390
PDF size: 339.53 Kb.


ABSTRACT

The type of lodging for laying hens in the State of Yucatan, Mexico is usually open houses, and hens are exposed to climatic conditions like maximum and minimum temperature and relative humidity that affect hen performance, including feed intake, yield percentage and size of egg. The present paper was carried out in farms with a total pop-ulation of three million hens of the ISA Babcock B300 commercial line, from January 2000 to December 2002. The average maximum temperature was 33.83°C, 21.07°C minimum and relative humidity 75.81%. The months of April to October were the hottest and August to September the most humid. There was no difference (P › 0.05) among maximum and minimum temperature and relative humidity in respect to mortality percentage. Multiple regression equation showed that higher temperature and relative humidity increased mortality and affected feed intake. Per each degree centigrade, increase or decrease in temperature affects feed intake approximately 3.36%, which repre-sent 3.19 g/day. The main factors of mortality were: not diagnosed with 43.42%, cannibalism with 24.66% and cage fatigue with 19.52%. These percentages can change among farms due to quality of facilities, handling, nutrition, and external factors, basically climatic.


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