. A study of selections for the variation and inheritance of the size, shape and color of hens' eggs ... bated eggs were individually pedigreed after 1911. For the 1912and 1913 hatches, the compartments of the pedigree trays were madesmall enough to hold just one egg, and thus it was possible to know fromwhich egg each chick hatched. In the 1914 hatch and after that time,the chicks were satisfactorily hatched in cloth bags. The day-old chicks were weighed on the same direct-reading egg scalesas were used for the eggs. After this first weighing the chicks wereindividually weighed every four wee
. A study of selections for the variation and inheritance of the size, shape and color of hens' eggs ... bated eggs were individually pedigreed after 1911. For the 1912and 1913 hatches, the compartments of the pedigree trays were madesmall enough to hold just one egg, and thus it was possible to know fromwhich egg each chick hatched. In the 1914 hatch and after that time,the chicks were satisfactorily hatched in cloth bags. The day-old chicks were weighed on the same direct-reading egg scalesas were used for the eggs. After this first weighing the chicks wereindividually weighed every four weeks on a special type of milk balance,by which the weights could be accurately estimated to 1/100 these weights were transformed to grams, as was done for someof the correlation tables, the calculation was made by means of the formula,1 pound = grams. In the early part of the work a separate recordwas made of the vigor of the chicks. SHAPE CHARACTER The basis for selecting eggs for shape was the index figure obtainedby dividing the greatest width of the egg by its greatest length and. Fig. 8. specially designed ratchet micrometers heldby woodworking clamp, for egg measurements multiplying the result by 100. The measurements were made by speciallyconstructed ratchet micrometers with a J-inch face (fig. 8).5 Onemicrometer was adjusted for the egg length and one for the egg width. 5 These were manufactured by Brown & Sharpe, Providence, Rhode Island. 202 Earl W. Benjamin
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpoultry, bookyear1920
