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1999, Number 1

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Vet Mex 1999; 30 (1)

Comparison of productive performance in broilers using ventilation by positive pressure during seven weeks in houses with a natural environment

Marrufo VD, Quintana LJA, Castañeda SMP

Language: English/Spanish
References: 20
Page: 99-103
PDF size: 38.75 Kb.


ABSTRACT

The effect of positive pressure ventilation upon productive performance of commercial broilers was evaluated. 1524 one-day-old Peterson x Avian Farm unsexed chicks were housed in a natural environment house with two sections; each section was divided into six subsections. Birds were randomly assigned in two groups with six repetitions each one. In the section where the experimental birds were housed, a 1/3-HP-motor fan with arms of 0.5 m of diameter was set up; it had the capacity to move 300 m3 of air per minute. In this experimental group, positive pressure ventilation was applied with a flow volume of 30 lt of air/minute/kg of body weight. In order to keep the abovementioned volume, necessary adjustments were done every four days. The control group did not receive a positive pressure ventilation. The feeding system was divided into three stages (starter, grower and finisher feeds). No restrictive system was applied, and the birds consumed feed and water ad libitum. On the 49th day, the following productive data was determined: daily weight gain, mean body weight, cumulated feed intake, feed conversion ratio, general mortality percentage, mortality percentage due to ascitic syndrome (AS) (both percentages were normalized) productivity index and number of kilograms per square meter. Productive data of both experimental and control groups were compared using the "t" student test. The experimental group consumed less feed than the control one, 4.41 and 4.58 kg, respectively (P‹0.05). A better feed conversion ratio was observed in the experimental birds (1.853:1) in comparison with the control ones (1.940:1) with a significant statistical difference. Minor percentages of general mortality and mortality caused by the AS reached by the experimental group were 11.67 and 9.44%, respectively, whereas the control group reached 16.53 and 12.94% with significant statistical differences (P‹0.05). At the end of the trial, the experimental group showed the best productivity index (P‹0.05) reaching 227.84 points in comparison with the control group that reached 204.32. Finally, 23.76 kg per square meter were produced by the experimental group, whereas 22.24 kg by the control one (P‹0.05). Results show that the application of positive pressure ventilation had a positive effect on most of the productive parameters.


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