Bulletin Volume 187-197

Bulletin Volume 187-197

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...a serious reduction in the percentage of fertile eggs hatched. The reason for'managing in this way was again to get the greatest possible absolute number of chicks hatched about April 1, regardless of the relative proportion of chicks to eggs set. 3. Taking all the records together and using the averages in the computations it appears that, even with the handicaps mentioned, in the high fecundity lines it required only 2.6 eggs in the incubator in ip1 1 to produce one chicken three weeks old. In the low fecundity lines it required 3.2 eggs to make one chicken three weeks old These figures are for the whole of the hatching season of 1911, that is, from February 1 to June I. They do not represent the normal reproducing ability of the stock because of the heavy handicap explained above. In spite of this fact, however, these records can only be regarded as indicating an excellent performance. Certainly these figures for hatching and rearing give no support to the view that the constitutional vigor or vitality of the Station Barred Plymouth Rock stock has been impaired by many years of continued artificial incubation and rearing. When it takes but three eggs or less to produce a chick three weeks old the stock cannot be said to be in a condition of reduced vitality. 4. It is plain that there is no substantial difference between the females of the high fecundity lines and the females of the low fecundity lines with respect to hatching records. What small differences there are indicate that birds of the high fecundity lines are on the whole somewhat surer reproducers than those of the low fecundity lines. While the percentage of infertile eggs is smaller in the low fecundity lines, on the other hand the percentage of fertile eggs hatched is also...show more

Product details

  • Paperback | 80 pages
  • 189 x 246 x 4mm | 159g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236953762
  • 9781236953766