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Author: Leah Heron Schmitz Publisher: ISBN: Category : Heifers Languages : en Pages : 212
Book Description
Experiments were conducted to evaluate a broad range of factors that may influence growth and reproductive performance of replacement heifers. In Exp. 1, 109 Angus crossbred heifers were used to determine the effects of hormonal implants administered during the suckling phase on replacement heifer growth and reproductive performance. Implanted heifers had greater WW (P = 0.03) and BW at breeding (P = 0.09); however, onset of puberty and conception rates did not differ between treatments (P = 0.67). In Exp. 2, 81 Angus crossbred heifers were utilized to evaluate use of irrigated cool-season annual forage in post-weaning development. Heifers were assigned to triticale or native range pastures, plus protein supplement. In yr 1, heifers gained 0.09 and 0.27 kg/d (P = 0.21) when grazing native range and triticale, respectively. In yr. 2, heifers grazing triticale gained 0.76 compared to 0.42 kg kg per d (P = 0.03) for native range. In Exp. 3. 129 Angus crossed and Brangus heifers were assigned to either; CAKE, which consisted of a 1.9 cm pellet (20% CP, as fed basis) or Dried Distillers Grains plus Solubles, There was no difference in animal growth performance (P > 0.25), or in reproductive traits (P = 0.60). A two-year study (Exp. 4), in which 133 Angus-crossed heifers were fed different levels of supplement in order to achieve varying amounts of gain before breeding. Treatments were: 1) heifers were fed to achieve a high rate of gain for 28 d, then low for the next 28 d (HL); 2) Low rate of gain for 28 d then high gains for the last half of the 56 d period (LH); or a moderate rate of gain throughout the 56 d feeding period (MOD). There was no difference (P > 0.36) in animal performance or reproductive status across all treatments. Experiment 5 was designed to evaluate the use of irrigated warm-season annual forage as a means of developing heifers in the post-breeding period. Twenty-four Angus-crossed heifers were assigned to graze either sorghum x sudangrass or pearl millet 45 d after the breeding season. There was no difference (P > 0.52) between treatment groups in bred heifer performance. Similar performance between forages suggests that either is a reasonable choice for growing young pregnant beef heifers.
Author: Leah Heron Schmitz Publisher: ISBN: Category : Heifers Languages : en Pages : 212
Book Description
Experiments were conducted to evaluate a broad range of factors that may influence growth and reproductive performance of replacement heifers. In Exp. 1, 109 Angus crossbred heifers were used to determine the effects of hormonal implants administered during the suckling phase on replacement heifer growth and reproductive performance. Implanted heifers had greater WW (P = 0.03) and BW at breeding (P = 0.09); however, onset of puberty and conception rates did not differ between treatments (P = 0.67). In Exp. 2, 81 Angus crossbred heifers were utilized to evaluate use of irrigated cool-season annual forage in post-weaning development. Heifers were assigned to triticale or native range pastures, plus protein supplement. In yr 1, heifers gained 0.09 and 0.27 kg/d (P = 0.21) when grazing native range and triticale, respectively. In yr. 2, heifers grazing triticale gained 0.76 compared to 0.42 kg kg per d (P = 0.03) for native range. In Exp. 3. 129 Angus crossed and Brangus heifers were assigned to either; CAKE, which consisted of a 1.9 cm pellet (20% CP, as fed basis) or Dried Distillers Grains plus Solubles, There was no difference in animal growth performance (P > 0.25), or in reproductive traits (P = 0.60). A two-year study (Exp. 4), in which 133 Angus-crossed heifers were fed different levels of supplement in order to achieve varying amounts of gain before breeding. Treatments were: 1) heifers were fed to achieve a high rate of gain for 28 d, then low for the next 28 d (HL); 2) Low rate of gain for 28 d then high gains for the last half of the 56 d period (LH); or a moderate rate of gain throughout the 56 d feeding period (MOD). There was no difference (P > 0.36) in animal performance or reproductive status across all treatments. Experiment 5 was designed to evaluate the use of irrigated warm-season annual forage as a means of developing heifers in the post-breeding period. Twenty-four Angus-crossed heifers were assigned to graze either sorghum x sudangrass or pearl millet 45 d after the breeding season. There was no difference (P > 0.52) between treatment groups in bred heifer performance. Similar performance between forages suggests that either is a reasonable choice for growing young pregnant beef heifers.
Author: Richard M. Hopper Publisher: John Wiley & Sons ISBN: 1118470850 Category : Medical Languages : en Pages : 2206
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: David J Patterson Publisher: Elsevier Health Sciences ISBN: 032326137X Category : Medical Languages : en Pages : 210
Book Description
The latest information on heifer development in beef cattle for the food animal practitioner! Topics include rebuilding the US cowherd, physiology and endocrinology of puberty, nutritional development and the target weight debate, long-term reproductive health, effect of prenatal programming on development, economics of development, synchronization of estrus and ovulation, post breeding heifer management, management strategies for adding value to heifers, and more!
Author: John Sachse Publisher: ISBN: Category : Languages : en Pages :
Book Description
Sachse Family Angus is both a commercial and registered Angus cow-calf operation in Northeast Kansas and has been in operation since 1935. The end goal in mind is to provide quality female breeding seedstock to other beef producers with the hopes of improving their herds. Successful selection and development of beef replacement heifers have major long term effects on stayability in any herd and can even have a positive impact on the whole herd. The objective of this study is to create a decision tool to determine best heifer selection strategies. Specifically, taking a look at the cost of heifer development under a range of scenarios as it applies to more traditional heifer development. The depth of literature addressing the issue of buying or raising replacement heifers is vast, providing various degrees of analysis to help a producer make the best informed decision. Some economists would argue that no single aspect of beef production management is as complicated, or has such an economic impact as cow culling and replacement heifer decisions (Melton, 1980). Procedures and methods were created to analyze whether a producer should raise or develop their own replacement heifers. One method used in creating a decision tool is an enterprise budget. Enterprise budgeting is the systematic determination and listing of expected outputs, revenues, and costs due to the production processes required to produce one unit of an enterprise for a specified time period. To take this one step further, it is assumed a producer makes choices with respect to the combinations of productive factors and products. Partial budgets include an analysis of net returns from small changes or refinement to a ranch. It focuses on parts that change while building upon an enterprise budget. In essence, it fine tunes current operations while holding all else constant. The benefits of partial budgeting take a look at what will be the new or added revenue if a change is implemented on the ranch and what costs will be reduced or eliminated if taken place. What will be the new or added costs and what revenues will be reduced if a change takes place are also things to keep in mind. Therefore, the result will show a producer the net benefit of the change. In turn, Sachse Family Angus will use this information to build their registered and commercial replacement heifers either by developing their own or purchasing from other breeders. Overtime, this decision will be critical as it will impact their herd for years to come. In conclusion, maintaining a good sound, high functioning beef cow herd means selecting and developing quality replacement heifers to retain in the herd each year. An estimated 20% of heifers born each year at Sachse Family Angus are kept as replacement heifers. When managing home raised heifers or purchased heifers, maintaining costs and keeping them in check is crucial because they represent a large up-front investment. The bottom line of this research is to give the managers at Sachse Family Angus and other operations across the country a decision tool that can be used to analyze their current resources and the resources it will take to develop their own heifers successfully and in the most cost effective way or help them analyze if purchasing their heifers makes the most financial sense.
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: Leah Heron Schmitz
Author: Leah Heron Schmitz
Author: Richard M. Hopper
Author: David J Patterson
Author: John Sachse
Author: Justin Drew Rhinehart
Author: Vern Fogle
Author: R. B. Simpson
Author: Gary M. Veserat
Author: Harald Volden
Author: Nikki Lee Hojer