producers. This loss is estimated at $750 million annually nationwide. Calving difficulty increases calf death loss, cow mortality, labor and veterinary costs; it delays the return of cows to estrus and reduces conception rates. It also lowers calf weaning weight and market value, which results from breeding of young heifers and cows to easy calving bulls to reduce calving difficulty. Studies s...

Early weaning of calves (60 days old) is adopted in cow-calf operations for its high reproductive response. The objective of this research work was to find how age classes are related to beef quality in early weaning cull cows. Twenty four cows were grouped in four different age classes (teeth and number of calves produced) from two teeth and no calf produced, up to 12 years and 7 calves produc...

Three experiments were conducted to determine preliminary efficacy of sustained release needle-less implants in effecting cure in calves with bovine respiratory disease. One hundred and twenty beef calves with a rectal temperature > or = 40 degrees C and shallow or labored respiration and coughing were used in these experiments. Four groups (1-ceftiofur sodium injections [days 1, 2, and 3], 2-c...

OBJECTIVE To evaluate the effect of exposure to environmental mycobacteria on results of 2 commercial ELISAs for paratuberculosis in cattle. DESIGN Experimental trial. ANIMALS 19 weaned crossbred beef calves. PROCEDURES Calves were inoculated SC with 1 of 5 mycobacterial isolates (3 calves/isolate) derived from herds with high proportions of false-positive serologic reactions for paratube...

Corn-finished cattle are the backbone of US beef production system. Traditionally fed a total-mixed ration (TMR) where all feed ingredients mixed together, delivered, and daily to cattle. Previous research evaluated complete self-fed finishing rations diet is placed into self-feeder. With advancements in technology varieties corn, purpose this study was determine differences gains, efficiency, ...

Forty colostrum-deprived, cross-bred beef calves, including males and females 3 to 8 months of age, were procured and transported to the test facility 6 days before initiation of the study. On Day -2, each calf received 60 mL of challenge material by endobronchial infusion. Calves were randomly assigned to either Group 1 (saline at 2.0 mL/50 kg body weight by subcutaneous injection) or Group 2 ...

Context Reducing livestock emissions, the largest single contributor to agricultural is increasingly recognised as a high priority. The low biological efficiency of beef cattle, due their long gestation period, generational interval, and propensity be uniparous, contributes methane emissions intensity (kg CO2-e/kg product) compared most other food products.Aims We evaluate potential increasing ...

Since its formation, the Beef Reproduction Task Force (BRTF) has worked to enhance productivity and profitability of US beef herds by integrating research and extension efforts with the intent of more effectively transferring the use of reproductive technologies to the field. A key early step was to coordinate efforts in identifying effective breeding management protocols for beef cattle and to...

This cross-sectional study evaluated risk factors associated with farm-level bovine leukemia virus (BLV) seropositivity in 563 dairy and 490 beef farms throughout Japan. Twenty randomly selected cattle on each farm were serologically tested, and farm epidemiologiocal information was obtained through face-to-face interviews. Due to the large number of zero-prevalence dairy and beef farms, data a...