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Author : Feng Yang
Publisher :
ISBN 13 :
Total Pages : 194 pages
Book Rating : 4.:/5 (35 download)
Download or read book Factors Affecting Litter Size in Swine ... written by Feng Yang and published by . This book was released on 1949 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Clifford Dale Squiers
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (28 download)
Download or read book Factors Affecting Litter Size in Certain Strains of Swine and Their Crosses written by Clifford Dale Squiers and published by . This book was released on 1950 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Missouri-Columbia. Agricultural Experiment Station
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (896 download)
Download or read book Genetic and Environmental Factors Affecting Litter Size in Swine written by Missouri-Columbia. Agricultural Experiment Station and published by . This book was released on 1956 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cindy Jeanine Morrison
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (824 download)
Download or read book Some Factors Affecting Litter Size and Baby Pig Survival written by Cindy Jeanine Morrison and published by . This book was released on 1981 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vaithilingam Rathnasabapathy
Publisher :
ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.:/5 (276 download)
Download or read book Some Genetic and Environmental Factors Affecting Litter Size in Swine written by Vaithilingam Rathnasabapathy and published by . This book was released on 1956 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John Carr
Publisher : CRC Press
ISBN 13 : 1498704743
Total Pages : 1001 pages
Book Rating : 4.4/5 (987 download)
Download or read book Pig Health written by John Carr and published by CRC Press. This book was released on 2018-04-17 with total page 1001 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maintaining the health of pigs is vital in pig farming and production. This new book written by experts from around the world focuses on the health of pigs, first with coverage of the disorders of pigs organised by clinical sign and body system. The book explores environmental medicine and then health maintenance. Treatment options are discussed, emphasizing a reduction in antimicrobial use and an increased awareness of a holistic approach to treatment. The book includes over 1,500 high-quality illustrations to enhance the clinical description, as well as a wealth of high-quality videos to test the reader in making differential diagnoses with treatment options. Quizzes at the end of each section also encourage reflective learning. International experts from the UK, USA, Australia, Spain and Taiwan cover clinical examination of the individual pig and groups along with environmental medicine, making this the ideal reference for veterinary practitioners and students. Those interested in population medicine (poultry, aquaculture, cattle and small ruminant and apiaries) will particularly enjoy the holistic approach to veterinary medicine. All those who appreciate the many talents of pigs will enjoy the practical approach to managing the health of their animals. This book moves veterinary science forward, promoting health rather than treating disease. It will be your number one reference for keeping your pigs healthy.
Author : V. Rathnasabapathy
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (199 download)
Download or read book Genetic and Environmental Factors Affecting Litter Size in Swine written by V. Rathnasabapathy and published by . This book was released on 1956 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. O. Hetzer
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (31 download)
Download or read book Influence of Inbreeding and Other Factors on Litter Size in Chester White Swine written by H. O. Hetzer and published by . This book was released on 1940 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : L. Kirk Clark
Publisher :
ISBN 13 :
Total Pages : 392 pages
Book Rating : 4.:/5 (319 download)
Download or read book Factors that Influence Litter Size in Pigs written by L. Kirk Clark and published by . This book was released on 1985 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wesley Charles McEwen
Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.:/5 (189 download)
Download or read book Effectiveness of Selection for Productive Characteristics in Developing the Montana No. I Hogs written by Wesley Charles McEwen and published by . This book was released on 1952 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most important productive characteristics of hogs is reproductive efficiency. Reproductive efficiency is best measured by litter size at weaning. Litter size at birth and weight of the pigs at birth are among the most important factors affecting litter size at weaning. It has been demonstrated that less than 5 per cent of pigs weighing 1.5 pounds or less at birth survive to be weaned. It was the purpose of this study to determine the selection for litter size and birth weight of the pigs and the effects of this selection on subsequent generations during the development of the Montana No. 1 line of hogs. The data for this study were made available through the agencies cooperating in the development of the Montana No. 1 hogs, the Montana Agricultural Experiment Station and the Bureau of Animal Industry, United States Department of Agriculture. To facilitate comparisons between generations all litters farrowed by sows which were her second or third litter were eliminated from the study. A significant difference between the average birth weight of pigs of gilts whose dams were gilts and the average birth weight of pigs of gilts whose dams were sows was determined by analysis of variance. The pigs farrowed by gilts by sows were heavier. All spring litters farrowed by gilts by gilts were used in the study from farrowing records taken from 1939 to 1949. The selection for litter size, based on the average litter size of the litters from which the individual pigs were selected, was for larger litters. There was an increase in the average litter size of litters farrowed by gilts by gilts. However, environmental influences accentuated the changes in litter size greatly during the period of development studied. The amount of selection, based on the birth weight of the individual pigs selected, weighted for the number of times their genetic influence was weighted on the succeeding generation was not positively associated with the birth weight of their offspring. The selection for birth weight based on the average birth weight of the litter from which individual pigs are selected is the best indication of their inherent ability to utilize available environmental conditions as well as their ability to provide an adequate uterine environment for their offspring. There was selection for pigs from litters with average birth weights below that of average of the population from which they were selected. There was a decrease in the average birth weight of the live pigs farrowed. It has been demonstrated that environmental influences are the major cause of variations in the birth weights of new born pigs within the litter. It is therefore possible that the ability of a sow to farrow pigs of greater uniformity at birth is a heritable characteristic. Using the within litter standard deviation of birth weights of live pigs farrowed for each litter as an index to the uniformity of the birth weights of the litters from which the parents were selected and the uniformity of the birth weights of their litters. It was concluded that the characteristic is heritable. There was selection and progress made in the development of the line toward more uniform litters at birth.
Author : Liz Shankland
Publisher : Haynes Publishing UK
ISBN 13 : 9781785211010
Total Pages : 0 pages
Book Rating : 4.2/5 (11 download)
Download or read book Pig Manual written by Liz Shankland and published by Haynes Publishing UK. This book was released on 2016-11-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The idea of keeping a few pigs has undergone something of a renaissance and never before has it been so popular. The Pig Manual is a straightforward, no-nonsense guide to getting started - whether your interest is filling your freezer, starting a new business, managing land the traditional way, or simply taking on some charismatic new pets. Packed with color photos and clear step-by-step text, this manual is ideal for beginners who need advice on buying and rearing their first pigs. It's also a handy resource for the more experienced pig-keeper who occasionally needs to dip into a quick-reference manual for help and reassurance.
Author : Chantal Farmer
Publisher : BRILL
ISBN 13 : 9086868037
Total Pages : 452 pages
Book Rating : 4.0/5 (868 download)
Download or read book The gestating and lactating sow written by Chantal Farmer and published by BRILL. This book was released on 2023-09-04 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last book on the lactating sow was published over 15 years ago. This new book brings us up to date in current knowledge on the gestating and lactating sow. It covers new and important topics such as conditioning of gilts for optimal reproductive performance, feeding high fibre diets to gestating sows and providing various fat sources in gestation and lactation. It also describes the several key success factors to group-housing systems in gestation, which is a must due to the current move towards group-housing. The new concept of transition feeding for sows is discussed, as well as the factors involved in mammary development of gilts and sows, both of which are instrumental for maximum colostrum and/or milk yields. The impact of the human-animal interactions on sow welfare and performance is discussed with focus on new handling practices that could be developed to overbalance the negative interactions inherent to pig management systems. Updates on must-have topics, such as amino acid and energy requirements of sows, colostrum and milk yield and composition, and sow health are also provided. The subjects covered in this book will assist animal scientists, nutritionists, veterinarians and swine producers in learning the most recent information on relevant and current topics affecting sow production, and in knowing which areas are in need of further research efforts.
Author : Edinburgh COMMONWEALTH AGRICULTURAL BUREAUX
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (79 download)
Download or read book A Survey of the Factors Influencing Litter Size and Weight in Pigs written by Edinburgh COMMONWEALTH AGRICULTURAL BUREAUX and published by . This book was released on with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Verne Merrill Chapman
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (183 download)
Download or read book Genetic and Environmental Influences Upon Litter Size and Variation of Birth Weights in Berkshire Swine written by Verne Merrill Chapman and published by . This book was released on 1963 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Litter site and birth weight data compiled from the farrowing records of 275 litters out of 109 purebred Berkshire sows of the Oregon State University swine herd during the years 1953 to 1960 inclusive were used in this study. Genetic and environmental factors influencing four components of reproductive performance, namely, within litter variance of birth weights, litter size, number born dead and mean birth weight of pigs within a litter were evaluated by the method of stepwise multiple regression analysis. The estimate of within litter variance of birth weight was greater for larger litters but was decreased as the inbreeding coefficient of the litter increased. Litter size was depressed as inbreeding of dam increased; however, due to the structure of the herd there was an unusual positive relationship between inbreeding of litter and litter size. The latter observation leads to the conclusion that litter size is more strongly influenced by the genotype of the sow than by the genotype of the offspring. The number born dead in a litter increased as litters became larger. A disproportionate number of highly productive sows kept in the herd to advanced ages brought about an unusual ace-of-dam effect; there was, however, no basis for establishing that a greater number of dead pigs occurred in litters out of sows of different ages. The average birth weights of pigs within litters was smaller in larger litters. Average, birth weight was also decreased as the inbreeding of dam increased. Age-of-dam effects were not found to be important for any of the components of reproductive performance studied nor were consistent environmental effects found. An analysis of variance of sib groups was used to derive estimates of repeatability and heritability for within litter Variance of birth weights, litter size and litter weight. Data for these analyses were taken from the farrowing records of 44 scars which had farrowed two or more litters. The estimates of repeatability of within litter variance of birth weights was 0.02. This indicates that there was no tendency for sows to exhibit permanent differences for this character. The repeatability estimates of litter size and litter weight were 0.208 and 0.135 respectively. The heritability estimates of litter size as derived from the dam and sire component of the covariance of half sibs were 0.198 and 0.237. The estimate of heritability of litter weight at birth was 0.199. From these estimates it appears that progress from selection for improvement in all of the components of reproductive performance would be slow. An increased rate of progress will require a more accurate identification of superior genotypes Which can be accomplished, in part, by stabilizing temporary environmental factors.
Author : Francisco Feranil Peñalba
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.:/5 (89 download)
Download or read book Selection for Increased Litter Size in Swine written by Francisco Feranil Peñalba and published by . This book was released on 1984 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. O. Hetzer
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (552 download)
Download or read book Influence of Inbreeding and Other Factors on Litter Size in Chester White Swine written by H. O. Hetzer and published by . This book was released on 1940 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zoran Lukovic
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783843371063
Total Pages : 116 pages
Book Rating : 4.3/5 (71 download)
Download or read book Genetic Parameters for Litter Size in Pigs written by Zoran Lukovic and published by LAP Lambert Academic Publishing. This book was released on 2010-11 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Litter size is one of the most important traits in overall reproductive efficiency of breeding sows. The triat has low heritability, is measured only in females and is expressed relatively late. Genetic improvement for litter size is possible due to large enough direct additive genetic variance, the availability of records on many relatives and short generation interval. Litter size is affected by many environmental and genetic factors and interaction between them. The goal of this study was to determine covariance functions for litter size i.e. number of piglets born alive using random regression model. Further, the aim was to compare it with estimates of genetic components obtained by using repeatability and multiple-trait model.
