Download or read book Relations Between Weight at First Calving and Milk Production During the First Lactation written by Robert H. Miller and published by . This book was released on 1958 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Heat Stress and Body Weight on the Performance Health Survival and Physiology of Holstein Dairy Cattle written by Longfei Han and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improving heat-stressed animal health and survival through management, nutrition, and genetics is critical to profitability and sustainability on a dairy farm. The objectives of this dissertation were to estimate genetic parameters of heat tolerance in dairy cattle for the health and survival traits; to investigate the long-term impact of heifer development; and to examine the potential role of ghrelin in thermoregulation during heat stress. Five experiments were conducted and summarized. The first experiment investigated the effect of heifer development (measured as body weight at first calving, BWFC) on milk production and survival. First lactation 305-d milk yield and 24-month milk yield were analyzed with a linear model. Survival analysis was performed to estimate the impact of BWFC on survival. Heifers in the top 60% of body weight at first calving had significantly higher first lactation 305-d milk yield than lighter heifers, but no relationship of BWFC and first lactation 305-d milk yield existed within the top 60%. Relationships between BWFC and 24-month milk yield were not significant. Heifers with higher BWFC lost significantly more body weight in early lactation. While BWFC was a significant predictor of first lactation 305-d milk yield, it accounted for 3% of variation, suggesting that BWFC is not a primary contributor to variation in milk yield. Compared to the lightest heifers, heaviest heifers were 49% more likely to be culled at any given time. These data indicated that, among heifers managed similarly, heavier heifers produced more milk in first lactation than lighter heifers, but lost more BW, faced a higher risk of being culled, and did not produce more milk long-term. The second experiment examined 1), the effect of climatic conditions at birth on organic calf stayability to 365 d of age (STAY) and respiratory disease (RESP) by 365 d of age, and 2), the genetic parameters of organic Holstein calf heat tolerance (HT) for STAY and RESP. HT was defined as the rate of change in STAY and RESP when a calf was born under heat stress. The final dataset included 77,090 calves from 16 USDA certified organic farms and included 35,520 Holsteins for genetic analyses. Phenotypic data were combined with climatic data obtained from local weather stations based on the zip code. Phenotypic analyses were performed with a model that included THI, breed, diurnal THI variation (daily maximum THI -- daily minimum THI; DTV), contemporary group, breed, and genetic effects. Estimated breeding values were calculated for Holstein sires with more than 10 daughters in the dataset. By 365 d of age, 80% of the calves stayed in the herd, and 7% of the calves recorded at least one RESP. Calf STAY decreased and RESP increased when calves were born in THI over 65. The additive genetic HT effect was significant for STAY but not RESP. The heritability for STAY and RESP were 0.100 and 0.025, respectively. In conclusion, calf STAY, RESP, and HT for STAY were heritable in organic herds and can be improved through genetic selection. The third experiment investigated the genetic and environmental effect of heat stress at calving on organic cow health and survival. Health trait were mastitis, reproductive disease, disease during the transition period (TRAN); and stayability to 30 DIM (1 = stayed in the herd, 0 = culled or died by 30 DIM; STAY30). The final dataset included 83,394 lactations from 40,712 cows of 6 different breeds of which Holstein (32,007 lactations, 15,938 cows) were most frequent and were used for genetic analysis. Weather condition at calving was defined as cool (average THI

Download or read book Effect of Environment on Nutrient Requirements of Domestic Animals written by National Research Council and published by National Academies Press. This book was released on 1981-02-01 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Holstein Friesian World written by and published by . This book was released on 1922 with total page 1196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Relationships Between First Lactation Milk Yield First Calving Interval Herd Life Life time Milk Production and Descriptive Type Subtraits in Holstein Cattle written by John Everett Honnette and published by . This book was released on 1978 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Age and Weight at First Calving and First Lactation Length on Milk Production in Indian Buffaloes written by Ashok Kumar Chaturvedi and published by . This book was released on 1977 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dairy 2002 written by and published by . This book was released on 2004 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on Effects of Body Weight and Age at First Calving on First Lactation Milk Yield and First Lactation Length in Sahiwal and Its Friesian Half breds written by Rishi Dattagupta and published by . This book was released on 1977 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Beltsville Growth Standards for Holstein Cattle written by C. A. Matthews and published by . This book was released on 1954 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimum Age and Weight at First Calving for Milk Production in Different Genetic Groups of Dairy Cattle written by Ashok Kumar Jain and published by . This book was released on 1974 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nutrition and Lactation in the Dairy Cow written by Philip C. Garnsworthy and published by Elsevier. This book was released on 2013-10-22 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nutrition and Lactation in the Dairy Cow is the proceedings of the 46th University of Nottingham Easter School in Agricultural Science. Said symposium was concerned with the significant advances in the field of nutrition and lactation in the dairy cow. The book is divided in five parts. Part I deals with the principles behind nutrition and lactation of cows. Part II discusses the cow’s nutrient interactions; responses to nutrients that yield protein and energy; and the influence of nutrient balance and milk yields. Part III tackles the efficiency of energy utilization in cows and its relation to milk production. Part IV talks about food intake of cows and the factors that affect it, while Part V deals with the different feeding systems for cows. The text is recommended for those involved in raising cows and dairy production, especially those who would like to know more and make studies about the relationship of nutrition and lactation of cows.

Download or read book Designing Foods written by National Research Council and published by National Academies Press. This book was released on 1988-02-01 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This lively book examines recent trends in animal product consumption and diet; reviews industry efforts, policies, and programs aimed at improving the nutritional attributes of animal products; and offers suggestions for further research. In addition, the volume reviews dietary and health recommendations from major health organizations and notes specific target levels for nutrients.

Download or read book Effect of Weight at Calving and Subsequent Weight on Milk Production in a Lactation Among Cross breds written by Bhuwaneshwar Rai and published by . This book was released on 1986 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bioclimatology and the Adaptation of Livestock written by H. D. Johnson and published by . This book was released on 1987 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Animal Breeding Plans written by Jay L. Lush and published by Read Books Ltd. This book was released on 2013-04-18 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1943, “Animal Breeding Plans” contains a detailed guide on animal breeding designed for students with experience of genetics, embryology, breeds, and stock judging. It aims to furnish the reader with a clear understanding of the means available for improving the heredity of farm animals, especially what each possible method will or will not do well. Highly recommended for modern farmers and animal breeders. Contents include: “Origin and Domestication of Farm Animals”, “Consequences of Domestication”, “Beginning of Pedigree Breeding Methods in the United States”, “History of Animal Breeding Methods in the United States”, “Relation of the Breed Association to Breed Improvement”, “Genetic Principles in Animal Breeding”, “Mendelian Basis of Inheritance”, etc. Many vintage books such as this are increasingly scarce and expensive. It is with this in mind that we are republishing this volume now in an affordable, modern, high-quality edition complete with a specially-commissioned new introduction on farming.

Download or read book The Development Nutrition and Management of the Young Calf written by Carl L. Davis and published by Iowa State Press. This book was released on 1998-01-01 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indispensable resource for the dairy farmer or veterinarian, the researcher, teacher, or advanced student, this book puts the cutting–edge science of raising dairy calves into an accessible, usable form. Geared to those with a basic understanding of principles of animal nutrition and husbandry, the volume gives a comprehensive account of all aspects of calf rearing, from the rudiments of anatomy and development through the practicalities of feeding and housing. The Development, Nutrition and Management of the Young Calf begins with an overview of how the calf′s digestive system develops, highlighting the period of transition from preruminant to ruminant digestion. Here the authors provide information essential to understanding nutritional needs and restrictions during the liquid–feeding phase in the young calf as well as those factors that govern the development of a functional rumen. Major emphasis is given to the energy and protein requirements of the young calf, with attention to the effects of environmental temperature on energy requirements. The authors also review the adequacy of current National Research Council recommendations on the energy and protein requirements of young calves. They discuss the management, nutrition, and care of the pregnant cow as well as calving management necessary to deliver a healthy calf. Other topics include liquid–feeding systems, formulation and use of milk replacers and starter feeds, the weaning process, housing principles, and the interactions of nutrition and disease

Download or read book The Effect of Body Weight During the Rearing Period on Milk Production in Que bec Dairy Cattle written by Diana Figueroa Delgado and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Canadian dairy industry is composed of around 11,000 farms and approximately 1.4 million head, of which approximately 30 percent are heifers (Canadian Dairy Information Centre, 2018). Heifers are of great importance because they represent the future of dairy farms, and, without them, the herds could not evolve and continue producing over time. Producers select replacement heifers that have the potential to become more profitable than the existing cows that will eventually be replaced. Therefore, they should be raised to reach an adequate size and body weight for breeding, so that they can reproduce successfully, and subsequently become productive. This process of rearing replacement heifers can cost as much as 20 percent of the total production expenses on dairy farms (Delgado et al., 2015). The rearing period of a heifer does not only impact the actual growth rate of the animal early on; some researchers have also discussed longer-lasting effects on the animals' performance as lactating dairy cows (Soberon et al., 2012; Macdonald et al., 2005; Krpa̹lkova̹ et al., 2014). The objective of this research was to determine the effects of body weight during rearing on the future milk production of Quebec dairy cattle. This was performed by looking at three periods of growth in a heifer's pre-lactation life - birth to weaning; pre-pubertal; and post-pubertal - and analysing the effect of their respective body weight categories on future milk production. Data were provided by the Quebec Dairy Herd Improvement Agency (Valacta), and included body-weight measurements, breeding records, and information for first, second, and third and plus lactations of Holstein dairy cattle. The study covered the years 2000 to 2015, and analyzed production and economic variables such as milk, protein, and fat yield (lactation and 305-day), gross profit, milk value and feed cost. The analyzed data consisted of a total of 22,312, 16,352 and 7,494 animals for the first, second and the third and plus lactations, respectively.While there was a tendency for heavier body weights up until 90 days of life (birth to weaning period) to have higher yields than lighter weights, the body-weight category of 110 to 124kg (not the heaviest) was found to have a significant effect on future first lactation milk, protein and fat production. Furthermore, pre-pubertal body weight had a significant effect on the first, second, and third and plus lactations where higher weights produced significantly higher first and second milk and milk-component yields. The effect of body weight during the post-pubertal period was significant on the first and second lactation where animals that weighed 9́Æ410kg had higher milk, protein and fat yields.Some of the findings may have been influenced by the substantially lower number of observations in the third and later lactations, pointing to the industry's challenge of longer herd life. In addition, the lack of animals that had weight measurements (both a sufficient number, and a range throughout the complete rearing period) serves to encourage increased recording by producers and advisors, so that the data can be used for better lifetime analyses." --