Comparison of Air Decontamination in Hatcher by 37% Formaldehyde Application Methods During Hatching
The results from the comparison of the air decontamination in the hatcher after 37% formaldehyde application methods during hatching by 2 trials are presented in Figure 1. In the first trial (Figure 1a), the 2 experimental groups (A and B), which received 37% formaldehyde through CRI during hatching, and experimental group C, which received 37% formaldehyde only once into a basin at the time of transfer, had a significantly superior inhibitory effect on aerosol bacterial counts 12 h after transfer than those of the negative control group (D) (P < 0.05). The 2 experimental groups (A and B) also had a significantly superior inhibitory effect on aerosol bacterial counts 4 h before the hatching than group C. Between the 2 experimental groups (A and B), experimental group A, which received 226.8 g of 37% formaldehyde through CRI at the time of transfer, an additional dosage every 12 h, and a final dose at 12 h before chick removal, had significantly lower aerosol bacterial levels 4 h before the hatching as compared with group B, which received 56.7 g of 37% formaldehyde through CRI at the time of transfer, at pipping, an additional dosage every 4 h, and a final dose at 4 h before chick removal (P < 0.05)
Comparison of Air Decontamination in Hatcher by 37% Formaldehyde Application Methods During HatchingThe results from the comparison of the air decontamination in the hatcher after 37% formaldehyde application methods during hatching by 2 trials are presented in Figure 1. In the first trial (Figure 1a), the 2 experimental groups (A and B), which received 37% formaldehyde through CRI during hatching, and experimental group C, which received 37% formaldehyde only once into a basin at the time of transfer, had a significantly superior inhibitory effect on aerosol bacterial counts 12 h after transfer than those of the negative control group (D) (P < 0.05). The 2 experimental groups (A and B) also had a significantly superior inhibitory effect on aerosol bacterial counts 4 h before the hatching than group C. Between the 2 experimental groups (A and B), experimental group A, which received 226.8 g of 37% formaldehyde through CRI at the time of transfer, an additional dosage every 12 h, and a final dose at 12 h before chick removal, had significantly lower aerosol bacterial levels 4 h before the hatching as compared with group B, which received 56.7 g of 37% formaldehyde through CRI at the time of transfer, at pipping, an additional dosage every 4 h, and a final dose at 4 h before chick removal (P < 0.05)
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