Life Sciences Commons^™

Reproductive Characteristics Of Boars During And After Exposure To Increased Ambient Temperature , R. P. Wettemann, M. E. Wells, R. K. Johnson

Department of Animal Science: Faculty Publications

Reproductive performance of 12 11-month-old Yorkshire boars was determined during and after exposure to control or increased ambient temperatures. After 3 weeks adjustment at 23 C in temperature controlled chambers, six boars were heat stressed by exposure to 34.5 ± 1.0 C for 8 hr and 31.0 ± 1.0 C for 16 hr during each 24-hr period and six control boars were maintained at 23.0 ± 1.0 C for 11 weeks. All boars were subsequently exposed to 23 C for 6 weeks. Semen was collected twice weekly before, during and after heat stress and boars were naturally mated with gilts …

Increased Lamb Production With Rams Exposed To Short Daylengths During The Nonbreeding Season, B. D. Schanbacher

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Exposure of rams during the nonbreeding season (anestrous period) to short daylengths will initiate a new sexual cycle characterized by testicular growth, increased mating activity and improved semen quality. Lambing results accumulated from 300 potential matings indicate that rams exposed to artificial photoperiods of 8 hr light and 16 hr darkness for 10 weeks (referred to as rams on short-days) are more fertile than control rams maintained under the relatively long days of spring. When five control rams were penned individually with 30 ewes synchronized with progestogen and PMSG, 67% of the ewes were mated. Eighty-nine percent of the ewes …

G78-426 Popcorn Production, Nora D'Croz-Mason, Richard P. Waldren

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide addresses seed selection, soil requirements, production management, pest control, marketing and sale of popcorn.

Commercial popcorn production in the United States has always been concentrated in the Corn Belt. Iowa was the largest popcorn producer until the mid 1940s. As hybrids replaced open-pollinated varieties, popcorn production shifted to Illinois then to Indiana. During the mid 1970s popcorn production moved west, and in 1977 Nebraska became the nation's largest producer. During the 1980s popcorn acreage has fluctuated among states, but Nebraska often has had the nation's highest yield because 85 percent of its crop is irrigated.

G76-308 Principles Of Beef Cattle Selection, H.A. Fitzhugh, Jr.

University of Nebraska-Lincoln Extension: Historical Materials

Selection of superior seedstock leads to lasting genetic improvement by increasing the frequency of "desirable" genes and decreasing frequency of "undesirable" genes. The definition of "desirable" varies. Nature favors genes which improve fitness to survive and thrive in the natural environment. Man should favor genes which improve biological and economic efficiency of beef production.

The concepts, definitions, formulas and symbols that are the tools necessary for effective selection programs are discussed in this publication.

Grass-Woody Plant Relationships, A.W. Bailey, R.K. Gupta

Aspen Bibliography

No abstract provided.

Improvement Of Beef Cattle Through Breeding Methods. Summary Of Results From Regional Project Nc-1, Larry V. Cundiff, Keith E. Gregory

Nebraska Agricultural Experiment Station: Historical Research Bulletins

This publication is a revision of North Central Regional Publication 120, published by the Nebraska Agricultural Experiment Station (Research Bulletin 196) in July, 1961. It summarizes the more important results from this project during its first 19 years of operation. It is by no means complete and includes only what is considered to be the "highlights" of findings at this time. A bibliography of all publications that provided the basis for this summary statement is included. This publication is in the nature of a progress report on many aspects of beef cattle breeding research. Although it is based on considerably …

Relationship Between Measures Of Semen Quality And Fertility In Bulls Mated Under Natural Conditions, J. N. Wiltbank, W. W. Rowden, J. E. Ingalls

Nebraska Agricultural Experiment Station: Historical Research Bulletins

An evaluation of the relationship between several measures of semen quality and fertility of bulls mated under natural conditions has been conducted over a three-year period. Semen was collected three different times with an electro-ejaculator from bulls used in the fertility tests. Collections were made at weekly intervals. Fertility was evaluated by mating bulls to heifers starting about three days after the last collection. Semen quality refers to the percent abnormals and the percent motility evaluated at the time of collection. Fertility was measured by the proportion of heifers that settled at natural service. Several multiple regression equations were calculated. …

Fertilizer-Insecticide Mixtures On Corn, R. L. Miller, George D. Corder

Agronomy Notes

Soil fertility and insects are major factors that affect corn yields. The proper kinds and amounts of fertilizers and insecticides properly placed will make corn production more economical on fields where either or both are needed.

Principles Of Record Of Performance In Beef Cattle, K. E. Gregory, R. M. Koch, L. N. Hazel, D. Chambers

Nebraska Agricultural Experiment Station: Historical Circulars

This publication provides a summary of the basic principles that should be considered in Record of Performance Programs with beef cattle. These principles are based on the results of research being conducted under Regional Project NC-1 as interpreted by the research personnel who participate in this effort.

Bulletin No. 386 - Production Of Lettuce Seed As Affected By Soil Moisture And Fertility, Leslie R. Hawthorn, Leonard H. Polland

UAES Bulletins

Much of the lettuce seed produced in the United States is grown under irrigation in various western states. Few studies have been made to determine the extent to which yields of seed are influenced by soil moisture and other cultural conditions. Crops have been irrigated mostly on the basis of local practices and the general experience of the grower. Recent studies in Utah (Hawthorn 1951) showed rather conclusively that carrot and onion seed crops grown side by side under the same climatic conditions differ widely in their response to soil moisture. High seed yields were obtained from carrots grown under …

Bulletin No. 271 - Fertility Maintenance By Rotation And Manure, D. W. Pittman

UAES Bulletins

For several years there has been maintained on the Greenville Farm of the Utah Experiment Station an experiment to determine the relative value of different cropping systems and manurial treatments in maintaining the fertility of the soil.

Ec31-133 The Management Of Nebraska Soils (Revised March 1936), P.H. Stewart, D.L. Gross

University of Nebraska-Lincoln Extension: Historical Materials

The agricultural lands of this country are its greatest natural resource. History points out that nations with vast areas of good farm land are most likely to prosper and survive over long periods of time. Local communities, too, prosper and flourish in proportion to the productiveness of the surrounding land. Schools, social life, and business develop best in areas where the land is productive and properly managed and conserved.

Nebraska, in common with other states, has suffered by the depletion of soil fertility. The reduction in acres in legumes and grasses, and the deplation of the organic matter in the …