Reproductive Performance in Milking Cows Fed Different Levels of Urea PDF Download
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Author: Alfredo Serrano Q.
Publisher:
ISBN:
Category :
Languages : en
Pages : 186
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Book Description
Author: Alfredo Serrano Q.
Publisher:
ISBN:
Category :
Languages : en
Pages : 186
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Book Description
Author: Wendall Lewis Ryder
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 178
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Book Description
Author: Marcel Frajblat
Publisher:
ISBN:
Category :
Languages : en
Pages : 272
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Book Description
Author: Corwin Roy Holtz
Publisher:
ISBN:
Category : Dairy cattle
Languages : en
Pages : 448
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Book Description
Author: Pipat Arunvipas
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Cow-level milk urea nitrogen (MUN) is widely available for monthly milk testing on many dairy farms and therefore it provides an opportunity to be utilized as a predictor for other farm parameters if there was a clear understanding of the relationships between MUN and these parameters. This thesis examined the associations between MUN and reproductive performance, fecal nitrogen (N) and groundwater nitrate-nitrogen contamination in order to determine whether MUN was indicative of reduced reproductive performance or elevated fecal N or groundwater nitrate-N. The perceived and actual utility of MUN as an effective tool for monitoring protein and energy imbalances in dairy cows was also investigated.
Author: Barbara A. Stark
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 98
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Book Description
Author: Richard M. Hopper
Publisher: John Wiley & Sons
ISBN: 1118470850
Category : Medical
Languages : en
Pages : 2206
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Book Description
Bovine Reproduction is a comprehensive, current reference providing information on all aspects of reproduction in the bull and cow. Offering fundamental knowledge on evaluating and restoring fertility in the bovine patient, the book also places information in the context of herd health where appropriate for a truly global view of bovine theriogenology. Printed in full color throughout, the book includes 83 chapters and more than 550 images, making it the most exhaustive reference available on this topic. Each section covers anatomy and physiology, breeding management, and reproductive surgery, as well as obstetrics and pregnancy wastage in the cow. Bovine Reproduction is a welcome resource for bovine practitioners, theriogenologists, and animal scientists, as well as veterinary students and residents with an interest in the cow.
Author: W. Haresign
Publisher: Elsevier
ISBN: 148310026X
Category : Technology & Engineering
Languages : en
Pages : 200
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Book Description
Recent Advances in Animal Nutrition-1981 is a collection of papers that discusses the effects of dietary fat on milk composition, relating it to the biochemistry of fat synthesis in the mammary gland. The influence of concentrates on milk composition as well as the pattern and level of concentrate feeding on milk output are also covered. The book describes the need for better utilization of grass and grass products in dairy production, the mineral and trace element requirements of pigs; the importance of anion-cation balance in poultry diets and its effects on performance levels; and the selenium and cobalt requirements of ruminants. The problems of medicinal residues in animal products and the toxicological effects of aflatoxin residues in animal products are also considered. People involved in agriculture, dairy production and animal nutrition will find the book useful.
Author: Hélène Lapierre
Publisher: BRILL
ISBN: 9086868320
Category : Technology & Engineering
Languages : en
Pages : 384
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Book Description
Development in agricultural sciences, particularly in farm animal sciences, resulted in the increased productivity to meet the demand for high quality and relatively cheap protein sources for human nutrition. In parallel, this increased productivity challenges the adequate supply of nutrients, including protein and energy, needed to cover not only high performances, but also insure animal health and welfare, reproduction and quality of products in a sustainable environment. The precise understanding of the animal biology is crucial for animal health and welfare, sustainable animal production, and health of animal product consumers. This book focuses on combining basic and applied research and its practical applications. To achieve these goals, many important topics are presented and discussed in detail. The most important issues in this book are: physiological aspects of protein and energy metabolism and nutrition; animal health and welfare metabolic related issues; effect of feeds and feed processing on energy and protein digestion and metabolism; methodological aspects of research on protein and energy metabolism; environment protection and enhancement of the quality and health-promoting features of animal products. This book constitutes a good source of knowledge for those who like to be up to date with the newest trends and findings in energy and protein metabolism in farm animals.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The objectives of this study were to estimate the heritability of milk urea nitrogen concentration (MUN), describe the genetic and phenotypic relationships between MUN and reproductive performance, and estimate correlations among MUN breeding values and Danish breeding values for disease in Holsteins. Dairy Records Management Systems in Raleigh, NC provided lactation data. The Danish Agricultural Advisory Center provided breeding value estimates for disease. Heritabilities, genetic correlations and phenotypic correlations were estimated with an animal model using ASREML. Infrared (IR) and wet chemistry (WC) data were analyzed separately. Heritabilities were estimated with all lactations, as well as separately for parities one and two. Genetic and phenotypic correlations were estimated separately for parities one and two. Herd-test-day effects, age at calving, and days in milk were included in all models. Heritability estimates for WC MUN were 0.15 for all lactations, 0.14 for first lactation, and 0.09 for second lactation. Heritability estimates for IR MUN were 0.22 for all lactations, 0.22 for first lactation, and 0.23 for second lactation. Genetic correlations between first and second lactation MUN values were greater than 0.97 for both WC and IR. Genetic correlations for WC MUN and various measures of reproductive performance, including days to first service (DFS), first service conception (FSC), services per conception (SPC), and interval from first service to conception (IFC), were generally found to be not different from zero. The genetic correlation between WC MUN and days open (DO) in first lactation was 0.21, and between WC MUN and DO in second lactation, was 0.41, indicating higher WC MUN values were associated with increased days open. Phenotypic correlations were near zero for all measures. Genetic and phenotypic correlations for IR MUN and reproductive performance measures were not reported due to limited number of observations. Correlations among MUN breeding value estimates and Danish disease breeding values identified no significant relationships. Further investigations to identify possible non-linear relationships between MUN breeding values and Danish disease breeding values revealed no significant trends. While the results of this study indicate that heritable variation for MUN exists, the inability to identify significant genetic relationships to metabolic disease, reproductive performance, or foot and leg disease appear to greatly limit its use in selection for dairy cattle improvement in these areas at the present time.
