. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 12 MASS. EXPERIMENT STATION BULLETIN 364 Table 5.—Weight Increase OR Decrease FROM ] Housing TO March 1, AND Subsequent Mortality 1934 1935 1936 Three Years Classes of Birds Number Mortal- Number Mortal- Number Mortal- Total Mean of ity of ity of ity Birds Mortality Bird s Percent Birds Percent Birds Percent Percent Losing more than .25 lb. 3 2 3 0 8 Not changing weight 17 3 0 31 Gaining .26- .74 1b. 77 33 6 06 75 13 33 185 . 175 39 43 119 10 08 17
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 12 MASS. EXPERIMENT STATION BULLETIN 364 Table 5.—Weight Increase OR Decrease FROM ] Housing TO March 1, AND Subsequent Mortality 1934 1935 1936 Three Years Classes of Birds Number Mortal- Number Mortal- Number Mortal- Total Mean of ity of ity of ity Birds Mortality Bird s Percent Birds Percent Birds Percent Percent Losing more than .25 lb. 3 2 3 0 8 Not changing weight 17 3 0 31 Gaining .26- .74 1b. 77 33 6 06 75 13 33 185 . 175 39 43 119 10 08 171 465 lb. 225 193 8 81 182 600 lb. 136 158 12 03 127 421 lb. or more 51 21 57 100 72 223 15 76 Total Birds 684 608 641 1,933* *This table includes 3 fewer birds than Chart 3 because 3 individuals were not weighed when housed but were weighed for the remainder of the year. 9. Body Weight on March 1 and Subsequent Mortality The fact has been pointed out in Section 1 that maximum body weight of the first laying year was attained about March 1 and that weights taken at this time probably are the best measure obtainable of the body weight of a flock. It is highly desirable to know whether this mature body weight is in any way related to subsequent mortality. A population of 1,936 pullets was classified into quarter-pound weight classes starting with the minimum of pounds and extending to a maximum of pounds with respect to weight on March 1. The subsequent mortality was cal- culated to the end of a 365-day period in the laying houses for each weight class. The data are presented in Chart 3. CHART 3 WEIGHT ON MARCH FIRST SUBSEQUENT MORTALITY 1936 BIRDS. 400 sso BODY WEIGHT There were 29 birds that weighed less than 5 pounds on March 1. These birds were probably pathological when weighed, and their mortality ranged from. Please note that these images are extracted from scanned p
Size: 2115px × 1182px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthormassachusettsagricult, bookcentury1900, bookdecade1900
