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Author: Frederick Alexander Davidson Publisher: Forgotten Books ISBN: 9780331897784 Category : Mathematics Languages : en Pages : 30
Book Description
Excerpt from Measuring the Breeding Value of Dairy Sires by the Records of Their First Few Advanced Registry Daughters The breeding value of dairy sires lies mainly in their ability to transmit to their offspring factors for high milk and butterfat produc tion. The fact that all sires are not equal in this respect makes it necessary to select for breeding purposes only those sires transmitting the largest number of such factors. An expression of this transmitting ability may be found in part in the milk and butterfat productions of the daughters, and it is by means of these productions that breeders in general have measured the breeding value of dairy sires. This method of measuring breeding values, altho used extensively at the present time, is open to several objections. The productions of the daughters used in measuring the breeding value of dairy sires are those that are recorded in the advanced registers of the various purebred dairy cattle associations; daughters with records in these registers have fulfilled certain production requirements and are spoken of as tested daughters. The tested daughters of a sire, in most cases, represent only his best daughters, which are a small percentage of all his daughters. This selection is due in part to the requirements of'the advanced registers, but in the main to the fact that under the present system of advanced registry testing it is exceedingly unprofitable to test daughters other than those showing signs of high producing ability. The productions of only the tested daughters, there fore, do not provide an absolute basis upon which to measure the breeding value of the sires. However, since the tested daughters of all sires have been subjected to the same type of selection, their produc tions provide a uniform basis and may be used as a means of measure ment with the limitation that they will give only relative results. 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.
Author: Frederick Alexander Davidson Publisher: Forgotten Books ISBN: 9780331897784 Category : Mathematics Languages : en Pages : 30
Book Description
Excerpt from Measuring the Breeding Value of Dairy Sires by the Records of Their First Few Advanced Registry Daughters The breeding value of dairy sires lies mainly in their ability to transmit to their offspring factors for high milk and butterfat produc tion. The fact that all sires are not equal in this respect makes it necessary to select for breeding purposes only those sires transmitting the largest number of such factors. An expression of this transmitting ability may be found in part in the milk and butterfat productions of the daughters, and it is by means of these productions that breeders in general have measured the breeding value of dairy sires. This method of measuring breeding values, altho used extensively at the present time, is open to several objections. The productions of the daughters used in measuring the breeding value of dairy sires are those that are recorded in the advanced registers of the various purebred dairy cattle associations; daughters with records in these registers have fulfilled certain production requirements and are spoken of as tested daughters. The tested daughters of a sire, in most cases, represent only his best daughters, which are a small percentage of all his daughters. This selection is due in part to the requirements of'the advanced registers, but in the main to the fact that under the present system of advanced registry testing it is exceedingly unprofitable to test daughters other than those showing signs of high producing ability. The productions of only the tested daughters, there fore, do not provide an absolute basis upon which to measure the breeding value of the sires. However, since the tested daughters of all sires have been subjected to the same type of selection, their produc tions provide a uniform basis and may be used as a means of measure ment with the limitation that they will give only relative results. 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.
Author: F a 1897- Davidson Publisher: Legare Street Press ISBN: 9781019588130 Category : Languages : en Pages : 0
Book Description
This book is a comprehensive guide to measuring the breeding value of dairy sires. It provides detailed instructions for evaluating bull progeny, including how to analyze data and calculate breeding values. By following the guidelines provided in this book, farmers and breeders can make informed decisions about which sires to use in their breeding programs, ultimately leading to healthier, more productive herds. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: F A (Frederick Alexander) Davidson Publisher: Hassell Street Press ISBN: 9781015212985 Category : Languages : en Pages : 36
Book Description
This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: John Chambers McDowell Publisher: Forgotten Books ISBN: 9780364779996 Category : Business & Economics Languages : en Pages : 22
Book Description
Excerpt from Better Cows From Better Sires: A Study of Cow-Testing Association Records of Dams and Their Daughters The proved purebred dairy sire seems to be the best solution of the dairy-breeding problem. He may be proved through cow-testing association figures, through advanced-registry testing, or through private records. How such sires may be kept until the production records of the daughters become available is one of the unsolved problems of the dairy world to-day. Every dairyman is interested in its solution. 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.
Author: U. S. Bureau of Dairy Industry Publisher: Forgotten Books ISBN: 9781396255724 Category : Reference Languages : en Pages : 112
Book Description
Excerpt from List of Sires Proved in Dairy Herd Improvement Associations, 1935-37: Arranged by Breeds The proved-sire record as summarized here should be considered merely as an indication and not as conclusive evidence of the breeding value Of the sire in question. If the difference between the average butterfat production of the dams and that Of the daughters is less than 25 pounds, additional dam-and-daughter comparisons may con ceivably reverse the results Of the summary. In general, however, a proved-sire record that includes a large number of dam-and-daughter comparisons can be considered as better evidence Of the sire's breeding value than a record that includes only the minimum number Of comparisons permitted in sire-proving work. Also, the greater the number Of lactation records included in the average record Of each dam and daughter the more dependable the proved-sire record. To make the most intelligent selection of a sire, the dairyman Should use these proved - sire records to single out the most promising sire and then make every effort to supplement these data with additional information gathered from the herds in which the dams and daughters made their records. Particular attention should be given to the feeding practices and environmental conditions under which the records were made, in order to be assured that the records Of the daughters were not made under more favorable conditions than those Of the dams or vice versa. It is especially important to deter mine that there has been no selection Of daughters in making the comparison. 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.
Author: Frederick Alexander Davidson
Author: Frederick Alexander Davidson
Author: F a 1897- Davidson
Author: Frederick Alexander Davidson
Author: F A (Frederick Alexander) Davidson
Author: F. A. Davidson
Author: Fred A. Davidson
Author: F. A. Davidson
Author: John Chambers McDowell
Author: Arthur Chester Ragsdale
Author: U. S. Bureau of Dairy Industry