josy
In the Brooder
yes a lot of it only a scientist would understand but here's a few key points, hope it helps
The present study was carried out to determine the sex of the fertilized white layer eggs with using morphological measurements. A total of 300 Super Nick White Layer (54 wks of age) eggs were incubated and sexed in the end of incubation period. Before incubation egg length, width and weight were measured. The egg volume and shape index were estimated with using these measurements for each egg. The effect of egg weight and replicate number was not significant on the sex of the hatching chick (p > 0.05). The effects of egg shape index (p = 0.001), egg length (p = 0.0018), egg width (p < 0.01) and volume (p = 0.004) of the egg had significant effect on the sex of hatching chick. According to the results of the current study, morphological measurements of the pre-incubated egg might be an indicator of sex of the hatching chick. The shape index and egg volume were more informative for the likelihood of the sex of hatching chick. According to the positive results of the current study, it is possible to incubate more female chicks with using the morphological measurements of egg. This may increase the incubation capacity and decrease the number male chicks that are killed at layer hatcheries.
The effect of shape index on the hatching chick sex was the most prominent factor for determining the sex of the egg in white layers. Hosmer & Lemeshow goodness (GOF) of fit (Hosmer & Lemeshow, 1989) test was found 0.923 for the model selected in stepwise selection. The effect of egg weight and replicate number was not significant on the sex of the hatching chick (p > 0.05). The effects of shape index (p = 0.001), egg width (p < 0.01), egg length (p = 0.0018) and volume (p = 0.004) of the egg had significant effects on the sex of hatching chick.
Pair-wise comparisons of groups for significant effects were shown in Table 2. The results of shape index values showed that eggs with less shape index values (< 74 vs. > 77) less likely have female chicks. And also eggs with medium versus greater egg shape index values tend to produce less female chicks. According to the egg width results; eggs with greater egg width (< 42 vs. > 44 mm) were 12% more likely to be the female chicks. The same results were also estimated for 42-44 vs. > 44 mm egg width, which was 33% more likely to have the female chick. When egg length was considered, shorter eggs (< 56 mm) were less likely (30%) to produce female chicks when compared to longer eggs (> 60 mm). Egg volume was also another factor that affects the likelihood of the sex of hatching chick. Eggs with smaller volume were more likely to have female chicks but the eggs with greater volume 71% more likely to have the male chicks.
In our study probability of hatching a female chick was increased with the increase of the width of the hatching eggs with rounded shape and with greater width were more likely to produce female chicks. On the other hand, pointed shape and narrow were more likely to produce male chicks. The probability of hatching a female chick was decreased with the increase of the length of the hatching egg
In conclusion, morphological measurements of the pre-incubated egg might be an indicator of the hatching chick sex. Especially the shape index values were more informative for the likelihood of the hatching chick. These results, according to the animal welfare legislations of EU, might have an important impact on layer hatchery management. Also, a machine that estimates the shape index under commercial conditions might be developed to decrease the hatching male chicks which are also being disposed at the hatching day. Furthermore, more data would be helpful to increase the reliability of the model and exact interval for each significant factor of likelihood of the hatching chick might be estimated more preciously.
The present study was carried out to determine the sex of the fertilized white layer eggs with using morphological measurements. A total of 300 Super Nick White Layer (54 wks of age) eggs were incubated and sexed in the end of incubation period. Before incubation egg length, width and weight were measured. The egg volume and shape index were estimated with using these measurements for each egg. The effect of egg weight and replicate number was not significant on the sex of the hatching chick (p > 0.05). The effects of egg shape index (p = 0.001), egg length (p = 0.0018), egg width (p < 0.01) and volume (p = 0.004) of the egg had significant effect on the sex of hatching chick. According to the results of the current study, morphological measurements of the pre-incubated egg might be an indicator of sex of the hatching chick. The shape index and egg volume were more informative for the likelihood of the sex of hatching chick. According to the positive results of the current study, it is possible to incubate more female chicks with using the morphological measurements of egg. This may increase the incubation capacity and decrease the number male chicks that are killed at layer hatcheries.
The effect of shape index on the hatching chick sex was the most prominent factor for determining the sex of the egg in white layers. Hosmer & Lemeshow goodness (GOF) of fit (Hosmer & Lemeshow, 1989) test was found 0.923 for the model selected in stepwise selection. The effect of egg weight and replicate number was not significant on the sex of the hatching chick (p > 0.05). The effects of shape index (p = 0.001), egg width (p < 0.01), egg length (p = 0.0018) and volume (p = 0.004) of the egg had significant effects on the sex of hatching chick.
Pair-wise comparisons of groups for significant effects were shown in Table 2. The results of shape index values showed that eggs with less shape index values (< 74 vs. > 77) less likely have female chicks. And also eggs with medium versus greater egg shape index values tend to produce less female chicks. According to the egg width results; eggs with greater egg width (< 42 vs. > 44 mm) were 12% more likely to be the female chicks. The same results were also estimated for 42-44 vs. > 44 mm egg width, which was 33% more likely to have the female chick. When egg length was considered, shorter eggs (< 56 mm) were less likely (30%) to produce female chicks when compared to longer eggs (> 60 mm). Egg volume was also another factor that affects the likelihood of the sex of hatching chick. Eggs with smaller volume were more likely to have female chicks but the eggs with greater volume 71% more likely to have the male chicks.
In our study probability of hatching a female chick was increased with the increase of the width of the hatching eggs with rounded shape and with greater width were more likely to produce female chicks. On the other hand, pointed shape and narrow were more likely to produce male chicks. The probability of hatching a female chick was decreased with the increase of the length of the hatching egg
In conclusion, morphological measurements of the pre-incubated egg might be an indicator of the hatching chick sex. Especially the shape index values were more informative for the likelihood of the hatching chick. These results, according to the animal welfare legislations of EU, might have an important impact on layer hatchery management. Also, a machine that estimates the shape index under commercial conditions might be developed to decrease the hatching male chicks which are also being disposed at the hatching day. Furthermore, more data would be helpful to increase the reliability of the model and exact interval for each significant factor of likelihood of the hatching chick might be estimated more preciously.
