Early Weaning Calves at 5 Months as a Factor Influencing Performance of Primiparous Heifers and Their Calves PDF Download
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Author: Shaun Howard Sweiger
Publisher:
ISBN:
Category : Calves
Languages : en
Pages : 86
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Book Description
Author: Shaun Howard Sweiger
Publisher:
ISBN:
Category : Calves
Languages : en
Pages : 86
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Book Description
Author: Michael J. Fields
Publisher: CRC Press
ISBN: 9780849387548
Category : Nature
Languages : en
Pages : 414
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Book Description
Factors Affecting Calf Crop summarizes the latest information available from leading cattle physiologists and geneticists regarding factors known to influence the production of live calves at weaning. You get practical information on management techniques for improving reproduction efficiency in the herd. You'll also learn about the functioning of the reproductive system and how this may affect reproductive processes in the cow herd. Managers will benefit from a clearer understanding of the factors known to limit efficient reproduction, while veterinarians and other professionals who advise cattlemen will appreciate the substantial reference material and color photographs for defining cow condition scores. Color photographs are also used to illustrate the discussions of testicular thermographies and their applications. Other chapters in the book cover developments in improving reproductive performance of the replacement heifer, the brood cow, and the bull. Topics on reproduction include physiology/endocrinology, the use of growth promotants, genetics and physiological and economic considerations in selecting the age to breed heifers, heritability of fertility, length of the breeding season, prepartum and postpartum nutrition, nursing by the calf, cloning of embryos, and much more.
Author: Justin W. Adcock
Publisher:
ISBN:
Category :
Languages : en
Pages :
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ABSTRACT FACTORS INFLUENCING COW PERFORMANCE AND INTAKE Two studies were conducted to determine how weaning system, residual feed intake (RFI), and residual average daily gain (RADG) affect cow performance and intake. In Study 1, a two-year study was conducted using Angus and Simmental X Angus heifers (n=114) to evaluate how weaning system (early weaning (EW) vs. normal weaning (NW)) affects cow-calf performance and intake. All cows with male calves were early weaned at 130 d while cows with female calves were normal weaned at 200 d. These animals were then evaluated for individual intake at 60 d, 120 d, 180 d, and 240 d postpartum. Weigh-suckle-weigh (WSW) was used to determine milk production for the lactating periods. BW, Hip height, body condition score (BCS, 1-9 scale), and backfat via ultrasound were measured. No differences (P > 0.05) were noted in the 60 and 120 d postpartum cow measurements, but calf BW did differ (P 0.05) with male calves being heaver. At 180 d postpartum cows with their offspring early-weaned had increased (P
Author: Jennifer Marie Barker
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 226
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Author: David L. Braun
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 76
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Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1860
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Author: William T. Meteer
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Angus and Angus x Simmental calves (n=200) were randomly allotted to one of five dietary treatments at two locations: Early Wean Starch Diet (EWS), Early Wean Fiber Diet (EWF), Creep Fed Starch Diet (CFS), Creep Fed Fiber Diet (CFF), or Control (CON). Control calves were normal weaned and received no supplemental feed while they grazed with their dams. The diets fed to early-weaned and creep-fed cattle were formulated to be isonitrogenous. Early-weaned calves (133±21 days of age) were placed in the feedlot, while normal-weaned calves remained with their dams on pasture (2 or 3 replications per location). Creep feed was offered ad-libitum to CFS and CFF. After a 100 d treatment phase, calves were placed in the feedlot on a common diet. GrowSafe® was used to measure individual intake of all calves in the feedlot. In the treatment phase, early-weaned gained more than creep-fed (1.6 vs. 1.5 kg, P
Author: Malik Zawar Hussain
Publisher:
ISBN:
Category :
Languages : en
Pages :
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![Biostatistical Analysis of Factors Influencing Lactation Performance of Range Cows and Weaning Weights of Their Calves [microform] PDF](https://books.google.com/books/content/images/frontcover/8xXa0AEACAAJ?fife=w80-h100)
Author: Sarah Louise Butson
Publisher: National Library of Canada
ISBN: 9780315059559
Category : Calves
Languages : en
Pages : 0
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Book Description
An investigation was carried out to examine trends in lactation performance and factors influencing milk traits and calf weaning weight among range beef cattle. Cows representing four beef and dairy-beef breeds and lines from the University of Alberta beef herds ranging in age from 2 to 10 years of age were used in the study. June and September measurements of milk and constituent percentages were taken on 206 and 242 cows in 1976 and 1977 respectively. Age and breed of dam, and age and sex of calf were recorded. Other variables examined were cow weight changes during gestation and lactation and birthweights, weaning weights and preweaning ADG of their calves. Milk variables and calf weaning weights were the traits studied. In Chapter I the lactation performance of the four breed groups of dams was examined. Results indicated that crossbred cows with dairy breed ancestry yielded more milk and were more persistent than a purebred traditional beef breed. Trends between breeds for constituent percentage production were less noticeable although the dairy crossbreds tended to produce less butterfat% than the purebreds. In Chapter II factors influencing milk and constituent yields were investigated using the multiple regression technique in Chapter II. Stepwise regressions involving age and breed of dam accounted for between 34.0% and 44.0% of the variance in any of the milk or constituent yields. Full and restricted regression models allowed the introduction of independent variables after adjusting for age and breed of dam effects. Calf preweaning ADG showed a high association with milk yield variables. Other factors such as calf birthweight and cow weight changes however did not account for a significant proportion of the variance in any one milk or constituent yield variable. Because associations and correlations between milk yield and calf ADG were significant but only moderately high, all factors influencing weaning weights of range calves were examined in Chapter III. Regression analysis indicated that age and breed of dam effects accounted for an average of 47% of the variance in calf weaning weight. When age and breed of dam were not considered, milk or constituent yields accounted for approximately 40% of weaning weight variance. However, milk variables still accounted for up to 10% of the variance after accounting for the effects of age and breed of dam. Calf birthweight and cow weight changes had minor effects on calf weaning weight. As a significant proportion of the variance in weaning weight was accounted for by milk variables, which in turn are largely a reflection of the breed of dam, it was concluded that selection for increased lactation performance and the introduction of dairy breeds into the breeding program of a beef herd can effect meaningful increases the weights of calves weaned.
Author: Philipe Moriel
Publisher:
ISBN:
Category :
Languages : en
Pages : 159
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Experiment 2 demonstrated that EW heifers provided a high-concentrate diet for at least 90 d in drylot and EW heifers grazed on ryegrass pastures, had similar or greater growth performance than NW heifers. Furthermore, it provided evidence that early-exposure to a high-concentrate diet lead to metabolic imprinting effects, such as altered liver IGF-1 expression (during periods of similar nutritional management) and early puberty achievement of Bos indicus-influenced beef heifers. Calf weaning at the onset of the breeding season enhanced cow growth performance, and tended to enhance reproductive performance of multiparous cows.
