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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
111

Genetic and environmental influences on dystocia and sire evaluation for calving ease as a trait of a calf

St-Arnaud, Hilaire. January 1984 (has links)
No description available.
112

A topcross breeding experiment with outbred and inbred hereford sires/

Tallis, George Michael January 1957 (has links)
No description available.
113

Physiological factors associated with compensatory growth in beef cattle /

Fox, Danny G. January 1970 (has links)
No description available.
114

Economic analysis of futuristic beef cattle and forage production systems /

Chafin, Donald Gray January 1973 (has links)
No description available.
115

Some factors affecting bovine growth and efficiency /

Beerwinkle, Donald Royce January 1975 (has links)
No description available.
116

Relationships among rump and rear leg type traits and reproductive performance in Holsteins

Shapiro, Leland Sanford 20 December 1990 (has links)
This study was conducted to determine the relationships among the linear type traits of rump angle, rump width, rump length, rear legs side view, rear legs position, rear legs rear view, tailhead, vulva angle, mobility, pasterns, foot angle, and toes with reproductive performance (days open and times bred) in Holstein cows and to develop indices to predict reproductive performance from mathematical functions of the anatomical traits. Two trials were conducted. The first trial involved 7630 registered Holstein cows from Oregon and California. The regression analysis (R²) showed only 1.1% of the variability of times bred and 1.3% of the variability of days open was accounted for by the rump and rear leg type traits. In the second trial, 8155 Holstein cows, both registered and grade, were analyzed using the linear type traits of rump angle, rump width, rear legs side view, rear legs position, rear legs rear view and foot angle.. Grade and registered cows were analyzed separately to determine if differences in management between them would be reflected in the statistical analysis. Evaluator, lactation number (parity), season, geographic location, and the interaction of evaluator and lactation number had a significant effect on most of the type traits and the scorecard category (General Appearance, Mammary System, Dairy Character and Body Capacity) scores examined. The effects of these variables were statistically removed and the residuals of the type traits were used in the final regression analysis. Using stepwise regression analysis, several non-significant traits were omitted from the final model. The analysis used days open and times bred as dependent variables. Lactation number, mature equivalent milk, foot angle, rump width and their respective quadratics were independent variables, as were season calved and geographic location. The regression analysis (R²) indicated that 5.3% of the variability in days open and 4.7% of the variability in times bred in registered cows was accounted for by the type traits, foot angle and rump width, respectively, when the effects of season calved, geographic location, lactation number and mature equivalent milk were included in the model. For the grade cows the regression analysis (R²) indicated that 3.5% of the variability in days open was accounted for by foot angle. None of the type traits examined had a significant effect on times bred. This study detected no significant influence of rump angle or rear leg position, as described by the HFA linear classification program, on reproductive performance. However, our analysis indicated that fertility decreased as rear foot angles became more steep in grade and registered cows and as rump width increased in registered cows. / Graduation date: 1991
117

Genetic aspects of fertility and longevity in dairy cattle /

Roxström, Anki. January 2001 (has links)
Thesis (doctoral)--Sveriges lantbruksuniversitet, 2001. / Based on 5 previously prepared or published papers reprinted here. Includes bibliographical references.
118

Determining the nutritional and economic impact of feed waste when wintering beef cows in central Alberta

Yaremcio, Barry Joseph Victor. January 2009 (has links)
Thesis (M. Sc.)--University of Alberta, 2009. / Title from pdf file main screen (viewed on Nov. 25, 2009). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science in Animal Science, [Department of] Agricultural, Food and Nutritional Science, University of Alberta." Includes bibliographical references.
119

The effect of long-term supplementation with biotin on lameness, milk production and reproductive performance in pasture fed dairy cows /

Fitzgerald, Tracey. January 2001 (has links) (PDF)
Thesis (M. Agr. Sc.)--University of Queensland, 2002. / Includes bibliographical references.
120

Management practices to optimize reproductive efficiency in primiparous and multiparous suckled beef cows /

Bader, Jonathan F., January 2003 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2003. / Typescript. Includes bibliographical references (leaves 73-87). Also available on the Internet.

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