The Improvement of Dairy Cattle by the Study of the Genetic and Environmental Factors Affecting Milk Records and by Research Into the Development of Artificial Insemination PDF Download
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Author: Joseph Edwards
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Joseph Edwards
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Julius Van der Werf
Publisher:
ISBN: 9781786762986
Category : Cattle
Languages : en
Pages : 659
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Book Description
Author: United States. Agricultural Research Service. Animal Husbandry Research Division
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Author: Paul Christou
Publisher: Springer
ISBN: 9781461457961
Category : Technology & Engineering
Languages : en
Pages : 1869
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Book Description
Gathering some 90 entries from the Encyclopedia of Sustainability Science and Technology, this book covers animal breeding and genetics for food, crop science and technology, ocean farming and sustainable aquaculture, transgenic livestock for food and more.
Author: Lawrence William Specht
Publisher:
ISBN:
Category : Artificial insemination
Languages : en
Pages : 186
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Author: Emily Marie Sitko
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Research presented in this thesis aimed at improving the efficiency of dairy farms through the development of targeted reproductive management strategies (TRM) based on genomically enhanced predictions of fertility, and the elucidation of associations between genetic merit for fertility and biological outcomes that affect dairy cow reproductive performance.Chapter II and III present the results of an experiment designed to compare the association between genetic merit for fertility and reproductive and profitability outcomes of cows submitted for artificial insemination (AI) with management programs that prioritized AI at detected estrus (AIE) or timed AI (TAI). Another objective was to determine if cows with different genetic potential for fertility would present a distinct response to the strategies compared. The study presented in Chapter IV and V characterized associations between genetic merit for fertility and biological parameters known to alter reproductive performance of cows. Results presented in Chapter II and III indicated that primiparous Holstein cows of superior genetic merit for fertility had better reproductive performance than cows of inferior genetic merit for fertility regardless of the type of reproductive management used. In addition, the effect of TRM based on genetic merit for fertility on reproductive performance depended on the outcome or sets of outcomes of interest evaluated. For example, cows of superior and intermediate genetic merit for fertility had greater P/AI when managed with the predominant TAI program but reduced days to pregnancy when managed with the program that prioritized AIE. Cows of inferior fertility also had greater first service P/AI with the program that prioritized TAI but had similar days to pregnancy with both management strategies. From an economic standpoint, cows of inferior fertility had greater cash flow than cows of superior fertility. For cows in specific fertility groups, the effects of the reproductive management strategies compared generated differences in cash flow of potential value for commercial dairy farms. The study presented in Chapter IV and V demonstrated a potential association of genomic merit for fertility with physiological and endocrine parameters known to affect reproductive performance of dairy cows. Particularly, cows of inferior genetic merit for fertility had poorer uterine health, decreased response to synchronization of estrus and ovulation, and were more likely to present altered ovarian and hormonal phenotypes that led to more frequent expression of atypical estrous cycles as compared with cows of superior genetic merit for fertility. Overall, we observed that genetically enhanced predictions of fertility might be a suitable tool for decision making in TRM. Additionally, the value of TRM programs for cows of different genetic merit for fertility might be on improving aspects of herd management such as simplifying program implementation or reducing reliance on hormonal interventions while maintaining acceptable levels of reproductive performance. An improved understanding of biological differences associated with genetic variation, such as our observations in Chapter IV and V, may be beneficial for the development of novel TRM and technologies to improve the reproductive efficiency of dairy cattle. This novel information could also support the development of new traits for selection of fertility.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 552
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Author: Henning Steinfeld
Publisher: Food & Agriculture Org.
ISBN: 9789251055717
Category : Business & Economics
Languages : en
Pages : 418
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Book Description
"The assessment builds on the work of the Livestock, Environment and Development (LEAD) Initiative"--Pref.
Author: U.S. Office of Experiment Stations
Publisher:
ISBN:
Category : Agricultural experiment stations
Languages : en
Pages : 1100
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Book Description
Author: Ivar Johansson
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 280
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Book Description
At the present time there is a call for information on breeding procedures which cannot always be supplied because decisive experiments are lacking. The purpose of this little volume is to give a survey of the present knowledge in regard to the genetic of economically important characters of dairy cattle and the methods for their improvement.
