. Canadian journal of agricultural science. Agricultural Institute of Canada; Agriculture. 64 SCIENTIFIC AGRICULTURE February, 1921. There is also a hig'her correlation between this char- acter and total egg production, intensity of egg pro- duction and length of laying period than was the ease with the size of abdomen. Thickness of pelvic bones or rather of the body wall including the pelvic bones was estimated as ex- plained before and tlien correlated wit,li production. Only one correlation table is shown herewith, table 6, but the otiiier coefficients of correlation are of the same order.
. Canadian journal of agricultural science. Agricultural Institute of Canada; Agriculture. 64 SCIENTIFIC AGRICULTURE February, 1921. There is also a hig'her correlation between this char- acter and total egg production, intensity of egg pro- duction and length of laying period than was the ease with the size of abdomen. Thickness of pelvic bones or rather of the body wall including the pelvic bones was estimated as ex- plained before and tlien correlated wit,li production. Only one correlation table is shown herewith, table 6, but the otiiier coefficients of correlation are of the same order. It will be seen that there is no relation to egg production so far as this coefficient of correla- tion shows but an examination of table 6 shows that the high producers are grouped in three and that there is an apparent falling off in production of birds with a very t/iin or veiy thick jielvis. Graph I shows the mean production for the different classes in table 6. The classes showing the highest mean production coincide with those that include all the birds in laying condition. These account for tyhe low coefficient of correlation and indicate that hens with very tliin or very thick pelvis are likely to be relatively poor producers. The optimum thickness is apparently approximately 1-8"—9-32, but this may be expected to vary somewhat, particularly for differ- ent breeds. As mentioned before, Kent (5) found that thickness of pelvis or body wall showed a marked relation to laying condition. The mean thickness of pelvis for 40 laying hens was ±.002z" + .0035" 32 32 for those that were not laying, .showing that there was no difference in meaJi thickness at the time they were measured. Account nuist be taken, however, of the small number of birds laying and also that some of these were only in laying condition at t/ie time of either the first or second measurement and not for both. Another is the distribution, the layers being all co
Size: 1739px × 1436px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookleafnumber76, booksponsoruniversityo, booksubjectagriculture
