Life Sciences Commons^™

Time Of Lambing: Extension Manual, Keith Croker, Ian Mcfarland

Agriculture reports

No abstract provided.

Social Assemblages And Mating Relationships In Prairie Dogs: A Dna Fingerprint Analysis, Steven E. Travis, Con Slobodchikoff, Paul Kefan

Reproductive Behavior Collection

Mating system characterizations have been hindered by difficulties in accurately assigning parentage to offspring. We investigated the relationship between social assemblages and mating relationships in a territorial harem polygynous mammal, the Gunnison's prairie dog, using a combination of behavioral and molecular analyses. We demonstrate multiple paternity and an extraordinarily high incidence of extraterritorial fertilizations (i.e., 61% of all progeny), in combination with the existence of female kin groups. On this basis, we conclude that social assemblages alone provide a poor description of the Gunnison's prairie dog mating system, and suggest several potential reasons for the maintenance of territoriality in this …

Variances Of Additive And Dominance Genetic Effects For Ovulation And Twinning Rates In A Population Selected For Twinning, L. Dale Van Vleck, K. E. Gregory

Department of Animal Science: Faculty Publications

Estimates of variances due to additive and dominance genetic effects and permanent and temporary environmental effects were obtained for ovulation and twinning rates from a composite population selected for twinning rate. Measures of ovulation rate after 11 mo of age on 2,317 heifers with a total of 19,209 measures were used. Twinning measures were on 1,522 first-parity cows, 1,311 later-parity cows with a total of 3,571 measures, and 1,704 all-parity cows with 5,100 measures. Models included fixed effects of year-season-age at calving for twinning, and year-season of birth, age in months, and calendar month of measurement for ovulation rate. Four …

Genetic Trend And Environmental Effects In A Population Of Cattle Selected For Twinning, L. Dale Van Vleck, K. E. Gregory

Department of Animal Science: Faculty Publications

A selection experiment was established in 1981 to increase twinning rate in cattle. Results reported are through 1993 calf crops. Estimates of genetic parameters for a two-trait twinning and ovulation rate model with genetic groups were as follows: heritabilities of .03 for twinning and .07 for ovulation rates with a genetic correlation of nearly 1.00 and fractional permanent environmental variances of .06 for twinning and .05 for ovulation rate. Corresponding estimates when group effects were ignored were as follows: heritabilities of .08 and .08 and fractional permanent environmental variances of .02 and .04 for twinning and ovulation rates, respectively. Twinning …

Ec96-219 1996 Nebraska Swine Report, Duane Reese

University of Nebraska-Lincoln Extension: Historical Materials

The 1996 Nebraska Swine Report was prepared by the staff in Animal Science and cooperating Departments for use in Extension, Teaching and Research programs. This publications deals with research on swine reproduction, breeding, health, nutrition, economics, and housing.

1996 Nebraska Swine Report, Duane E. Reese

University of Nebraska-Lincoln Extension: Historical Materials

This publication was prepared by the staff in Animal Science and cooperating Departments for use in Extension,Teaching and Research programs. It deals with the results that were done in reproduction, breeding, health, nutrition, economics and housing of swine.

G96-1278 Use Of Cooled Stallion Semen, Kathleen P. Anderson

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide discusses the benefits of using cooled stallion semen for horse breeding.

Using cooled, transported stallion semen is quickly becoming a viable breeding option for many horse producers. An increasing number of breed associations are recognizing the benefits of cooled semen and making it an option for producers. Mare owner's who are able to use cooled semen experience less expense related to breeding, if the program is properly conducted. Transporting cooled semen from the stud farm to the mare allows owners to reduce mare care and transportation costs. Furthermore, because the mare will remain on-the-farm, there is less chance …