Author : Robert Frederick Miller
Publisher : Forgotten Books
ISBN 13 : 9780365105763
Total Pages : 34 pages
Book Rating : 4.1/5 (57 download)
Book Synopsis Fertility in Sheep as Affected by Nutrition During the Breeding Season and Pregnancy (Classic Reprint) by : Robert Frederick Miller
Download or read book Fertility in Sheep as Affected by Nutrition During the Breeding Season and Pregnancy (Classic Reprint) written by Robert Frederick Miller and published by Forgotten Books. This book was released on 2018-03-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Fertility in Sheep as Affected by Nutrition During the Breeding Season and Pregnancy Twinning. - The percentage lamb crop depends to a considerable ex tent upon the frequency of twinning. Twinning, in turn, largely depends upon the number of ova liberated from the ovary. When Hammond (13) killed and examined 80 pregnant ewes, he found 116 corpora lutea in the ovaries, 101 normal fetuses and 8 atrophied ones in the uteri; this left only 7 eggs to be accounted for. In adult pigs he found fertility to be dependent upon the percentage of fetuses developing normally, whereas in sheep, fertility depended largely upon the number of eggs shed at the heat period. As Kelley (19) has shown, the largest percentage of twins in Merino ewes is produced between four and ten years of age. The fertility of. Young sows is less than that of mature sows because fewer ova are shed (hammond, 12) and no doubt there is a similar relation between age and twinning ln ewes. J ones and Rouse (18) con cluded, from the literature covering a variety of Species, that in animals generally the litter size increases along with the age of the female. This increase usually goes to a maximum, followed by a decline. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.