. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 296 MASS. EXPERIMENT STATION BULLETIN 258 20 per cent of those used in 1927 lacked pause, and 67 per cent of those usea in 1928 lacked pause. The two groups of mothers were alike with respect to winter pause up to 1928. In 1928 check mothers were far superior to inbred mothers in freedom from winter pause. The percentage of daughters free from winter pause for the inbreds was as follows: 1926, 22 per cent; 1927, 31 per cent; and 1928, 27 per cent. For the same three-year period, check daughters exhibited
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 296 MASS. EXPERIMENT STATION BULLETIN 258 20 per cent of those used in 1927 lacked pause, and 67 per cent of those usea in 1928 lacked pause. The two groups of mothers were alike with respect to winter pause up to 1928. In 1928 check mothers were far superior to inbred mothers in freedom from winter pause. The percentage of daughters free from winter pause for the inbreds was as follows: 1926, 22 per cent; 1927, 31 per cent; and 1928, 27 per cent. For the same three-year period, check daughters exhibited 33 per cent, 27 per cent and 57 per cent free from pause. These data show that inbreeding has not affected winter pause in the inbred groups, because the inbred daughters of 1928 carried practically the same percentage of non-pause as existed in the inbred daughters of 1923. On the other hand, inbreeding the check birds for three years with selection for absence of pause in female parents has increased the percentage of non-pause birds from 20 per cent in 1923 to 57 per cent in 1928. - INBRSD DAMS - CHECK DAJIB - IKBRID DAUGHTERS - CHECK DAUGHTERS. 1927 1928 UATINO TEARS CHART 4.—Effect of Inbreeding on Intensity Chart 4 points to a very great difference between the percentage of mothers showing genetic high intensity (clutch size or more) and the percentage of their daughters showing high intensity. This difference was most pronounced in the inbred group during the first three years. The character of mothers used for inbreeding to produce these daughters should warrant a goodly proportion of high intensity daughters each year. Chart 4 suggests that possibly the inbred mothers laid at a slower rate because of low vigor. This observation is confirmed by the check group, when inbred during the last three years of the experiment. The check mothers used were superior to the inbred mothers in intensity during the first two years reported. Inbred daughters were aU decidedly low
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