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Author: Céline Bosquillon de Jenlis Publisher: ISBN: Category : Languages : en Pages : 34
Book Description
In New Zealand, cows are usually milked Twice A Day (TAD). But Once A Day milking (OAD) has become more and more practised recently. Research has been done in order to improve the knowledge of this system and to select the dairy cattle that is the most suitable to OAD milking. A 2004-2005 trial that involved 144 friesan cows was carried out at Dexcel. These animals were milked OAD or TAD from calving, but the TAD herd switched to OAD in January. Furthermore, they were allocated to a high or low milksolids (fat + protein) content groups based on the cows' results from the previous year or the heifers' genetic potential. Because Jersey cows, with concentrated milk, perform better on OAD milking than Friesians with less concentrated milk, i twas thought that the same results might occur within the Friesian breed. Analyses of Variance were used to compare the performances of the groups. In this trial, high milksolids content cows didn't seem to be better suited to OAD milking. No major significant differences concerning milk and milksolids yields were found between the high and low milksolids content animals. Some differences for the milk of cows milked once or twice a day were shown : OAD cows produce lower milk and milsolids yields and their milk contains more somatic cells. The change from TAD to OAD milking was followed by a decline in milk and milksolids yields, which quickly dropped to the OAD herd level. Unfortunately, there was no carry over from the TAD level. The udder capacity of each animal was measured three times throughout the lactation. It tended to be larger in November and January for cows milked TAD and for low milksolids content cows. Curves were fitted to the milk production of each cow. Although it is difficult to determine accurately the day of the peak milk yield, it is easier to find out peak milk yield. It appeared that TAD cows produce more mil kat peak than OAD. Low milksolids content cows with less concentrated milk have a higher peak yield than high milksolids content cows.
Author: Céline Bosquillon de Jenlis Publisher: ISBN: Category : Languages : en Pages : 34
Book Description
In New Zealand, cows are usually milked Twice A Day (TAD). But Once A Day milking (OAD) has become more and more practised recently. Research has been done in order to improve the knowledge of this system and to select the dairy cattle that is the most suitable to OAD milking. A 2004-2005 trial that involved 144 friesan cows was carried out at Dexcel. These animals were milked OAD or TAD from calving, but the TAD herd switched to OAD in January. Furthermore, they were allocated to a high or low milksolids (fat + protein) content groups based on the cows' results from the previous year or the heifers' genetic potential. Because Jersey cows, with concentrated milk, perform better on OAD milking than Friesians with less concentrated milk, i twas thought that the same results might occur within the Friesian breed. Analyses of Variance were used to compare the performances of the groups. In this trial, high milksolids content cows didn't seem to be better suited to OAD milking. No major significant differences concerning milk and milksolids yields were found between the high and low milksolids content animals. Some differences for the milk of cows milked once or twice a day were shown : OAD cows produce lower milk and milsolids yields and their milk contains more somatic cells. The change from TAD to OAD milking was followed by a decline in milk and milksolids yields, which quickly dropped to the OAD herd level. Unfortunately, there was no carry over from the TAD level. The udder capacity of each animal was measured three times throughout the lactation. It tended to be larger in November and January for cows milked TAD and for low milksolids content cows. Curves were fitted to the milk production of each cow. Although it is difficult to determine accurately the day of the peak milk yield, it is easier to find out peak milk yield. It appeared that TAD cows produce more mil kat peak than OAD. Low milksolids content cows with less concentrated milk have a higher peak yield than high milksolids content cows.
Author: Harald Volden Publisher: Springer Science & Business Media ISBN: 9086867189 Category : Science Languages : en Pages : 172
Book Description
NorFor is a semi-mechanistic feed evaluation system for cattle, which is used by advisors in Denmark, Iceland, Norway and Sweden. This book describes in detail the system and it covers five main sections. The first is concerned with information on feed characteristics, feed analysis and feed digestion methods. The second section describes the digestion and metabolism in the gastrointestinal tract and the supply and requirement of energy and metabolizable amino acids. The third section considers the prediction of feed intake and physical structure of the diet. The fourth section focuses on model evaluation and the final section provides information on the IT solutions and feed ration formulation by a non-linear economical optimization procedure. This book will be of significant interest to researchers, students and advisors of cattle nutrition and feed evaluation.
Author: Roy Kellaway Publisher: Landlinks Press ISBN: 0643098925 Category : Technology & Engineering Languages : en Pages : 190
Book Description
This book presents strategies for feeding energy and protein supplements to pasture-fed dairy cows and examines the potential economic benefits. Effective supplementary feeding of concentrates is critical to the success of all dairy farms. This book is a substantially revised edition of 'Feeding Concentrates: Supplements for Dairy Cows' DRDC 1993. It focuses on feeding concentrates to pasture fed cows to achieve high milk production per cow per hectare, and will assist farmers to decide which supplements give the best results in their particular situation. The benefits that arise from supplementary feeding include higher stocking rates, promotion of growth in heifers and young cows; better body condition score and increased lactation length when pasture is less available; improved pasture use; reduced cost per tonne of pasture eaten; flexibility to increase milk production when milk prices are high; and increased milk protein content when the energy content in pasture is low. This edition has thoroughly reviewed the issues and clearly documents the results of research particularly for grains supplementation. The summaries and recommendations in each chapter will be particularly helpful to dairy farmers in making best management decisions relating to concentrate feeding.
Author: Marija Klopčič Publisher: Brill Wageningen Academic ISBN: 9789086860845 Category : Cattle Languages : en Pages : 0
Book Description
The past decade has revealed unfavourable trends in e.g. fertility, udder health and locomotion in some major dairy cattle breeds due to a large increase in production and insufficient consideration of functional traits in the breeding goals. Such unfavourable trends in some functional traits increase costs. Additionally, the enlargement of herds leads to less available labour time per individual cow. This asks for cows that are easy to handle. At the same time, society is demanding a higher welfare standard of animals. These contradicting developments have increased the desire for so called more robust animals. Robustness can be defined as 'the ability to maintain homeostasis in commonly accepted and sustainable herds of the near future'; or 'the ability of the cow to function well in the environment she lives in as well as in a wide range of climates and production systems'. This book contains a series of articles (26) dealing with the concept of robustness, including aspects like evolution, genetics, environment, animal health and welfare, and integrity. Besides the major functional traits also the links to energy balance, hot climatic conditions, and the attitude and input of stakeholders towards robustness as part of the breeding program are discussed. This book is the first attempt to summarise the available knowledge concerning this topic in cattle, making this book unique. The contributions are from authors of 16 countries from all over the world. However, the focus is presently on farm animal level, while in future robustness of the whole production system may also require additional attention.
Author: Robert Jarrige Publisher: John Libbey Eurotext ISBN: 9780861962471 Category : Nature Languages : en Pages : 400
Book Description
Deals with feed evaluation systems, the nutrient requirements of ruminant livestock and the feeding value of a wide range of feedstuffs. This book lists about 800 typical forages, 65 crop residues and 120 concentrate and by-product feeds. It is suitable for teachers, specialist scientists and industrialists.
Author: National Research Council Publisher: National Academies Press ISBN: 0309037956 Category : Medical Languages : en Pages : 384
Book Description
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.
Author: Philip C. Garnsworthy Publisher: Elsevier ISBN: 1483100189 Category : Technology & Engineering Languages : en Pages : 442
Book Description
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.
Author: Céline Bosquillon de Jenlis
Author: Céline Bosquillon de Jenlis
Author: John Whittemore Gowen
Author: Colin William Holmes
Author: Walter Lee Gaines
Author: Harald Volden
Author: Roy Kellaway
Author: Marija Klopčič
Author: Robert Jarrige
Author: National Research Council
Author: Philip C. Garnsworthy