Beef Research Program Progress Report No. 1 (1982): Table of Contents

Authors

Date of this Version

1982

Document Type

Article

Comments

Published in Beef Research Program Progress Report (1982) No. 1: C-ii

Abstract

ROMAN L. HRUSKA U.S. MEAT ANIMAL RESEARCH CENTER, Robert R. Oltjen........iii

BREEDING AND GENETICS

Sixteen years of selection for weaning weight, final weight, and muscling score in Hereford cattle: Robert M. Koch, Larry V. Cundiff, and Keith E. Gregory. . . . . . . . . . . .. 1

Effects of heterosis in Hereford, Angus, and Shorthorn rotational crosses: Larry V. Cundiff, Keith E. Gregory, and Robert M. Koch. . . . . . . . .. . . . . . .. 3

Heterosis and breed maternal and transmitted effects in beef cattle: Keith E. Gregory, Larry V. Cundiff,and Robert M. Koch. . . . . . . . .. 6

Characterization of breeds representing diverse biological types: preweaning traits: Keith E. Gregory, Larry V. Cundiff, and Robert M. Koch. . . . . . . . . . . . . 7

Characterization of breeds representing diverse biological types: postweaning growth and puberty of females: Keith E. Gregory, Larry V. Cundiff, and Robert M. Koch . . . . . . . . . . . . . . . .. 9

Characterization of breeds representing diverse biological types: postweaning growth and feed efficiency: Larry V. Cundiff, Robert M. Koch, and Keith E. Gregory. . . . . . . . . . . . . . . . . . . . . . . . . 11

Characterization of breeds representing diverse biological types: carcass and meat traits of steers: Robert M. Koch, Larry V. Cundiff, and Keith E. Gregory. .... . . ... . . . . .. .13

Genetic variation among and within herds of Angus and Hereford cattle: Larry V. Cundiff and Keith E. Gregory. . . . . . . . . . 16

PHYSIOLOGY AND REPRODUCTION

Conception and embryonic development in the beef female: Ralph R. Maurer, Sherrill E. Echternkamp,and William F. Pope.. ... . .. . . . .. . . . . . . . .17

Blood flow to the uterus: Sherrill E. Echternkamp and Stephen P. Ford. . . . . . . . . . 19

Effect of pregnancy on disease resistance: Rita C. Manak. . . . . . . . . . . . . . . . 22

Preliminary observations on the immune status of newborn normal and weak calf syndrome calves: Rita C. Manakand William G. Kvasnicka. . . . . . . . . . . . . . . . . . . . . . 23

Decreasing the postcalving anestrous period in suckled beef heifers: Sherrill E. Echternkamp . . . 24

Testicular development and onset of puberty in beef bulls: Donald D. Lunstra . . . . . . . . . . . . . . . . . 26

Sexual aggressiveness in beef bulls: Donald D. Lunstra . . . . . . 28

Performance characteristics of feedlot bulls and steers implanted with Estradiol-17ft: Bruce D. Schanbacherand Ronald L. Prior .. . . . . . . . . . . . . . . . . . . . . . 29

NUTRITION

Blood flow and nutrient uptake of the bovine uterus and fetus: Calvin L. Ferrell, Ronald L. Prior, Ronald K. Christenson, and Stephen P. Ford. . . . . . . . . . . . . . . . . . . . . . 30

Effect of breed and postweaning rate of gain on onset of puberty and productive performance of heifers: Calvin L. Ferrell. . . . . . . . . . . . . . . 31

Elfazepam and Synovex-S influences on growth and carcass characteristics of steers fed two dietary energy levels: Ronald L. Prior, John D. Crouse, and Virden L. Harrison. . . . . . . . . . . . . . . 33

Energy utilization by mature cows: Calvin L. Ferrell and Thomas G. Jenkins . . . . . . . . . . . 34

Lipid synthesis in the beef animal: Ronald L. Prior and Stephen B. Smith . . . . . . . . . . . . . . . . . . . . . 34

MEATS

Chemical composition of carcasses from Hereford, Limousin, and Simmental crossbred cattle as related to growth and meat palatability: John D. Crouse and Michael E. Dikeman. . . . . . . . . . 36

Evaluation of traits in the USDA yield grade equation for predicting beef catcass cutability in breed groups differing in growth and fattening characteristics: John D. Crouse. . . . . . . . . . . . . . 37

Estimation of retail product of carcass beef: John D. Crouse. . . . . . . . . . . . . . . :39

Relationship of selected beef carcass traits with meat palatabiltiy: John D. Crouse. . . . . . . . . . . . . 40

AGRICULTURAL ENGINEERING

Methane and protein from beef cattle manure: Andrew G. Hashimoto, Yud-Ren Chen, Vincent H. Varel,and Ronald L. Prior. . . . . . . . . . . . . . . . . . . . . . . . . . 42

ANIMAL HEALTH

Cooperative project on the weak calf syndrome: William G. Kvasnicka. . . . . . . . . . . . . . . . 43