D.J. Lee

Effects of rancidity in choice white grease on growth performance and nutrient digestibility in weanling pigs

The addition of fat to nursery diets is a common practice. Research efforts about fat utilization by weanling pigs mainly has been focused on the effects of essential fatty acids, unsaturated:saturated ratios, chain length of the fatty acids, and age of the pigs when fat was added to the diet. Unfortunately, little attention has been given to the effects of fat quality, such as rancidity, on nursery pig performance. Our objective was to determine the effects of rancidity in choice white grease on growth performance and nutrient digestibility in weanling pigs.

Effects of feeder design (conventional dry feeder, dry shelf-feeder, and wet/dry shelf-feeder) on finishing pigs

In previous reports from KSU, we demonstrated that wet/dry shelf-feeders supported greater rates and(or) efficiencies of gain compared to conventional dry feeders. However, it has not been demonstrated whether the benefits observed with the wet/dry feeders resulted from the deep-bowl design that might prevent feed wastage or from the wet/dry concept. Thus, we designed an experiment to compare growth performance of finishing pigs when fed from conventional dry feeders and shelf-feeders used to deliver feed in dry or wet/dry form.

Effects of inorganic and organic acids on urine pH in lactating sows

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1998 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Effects of feeder design and pellet quality on finishing pigs

We have reported previously that pelleting improves rate and(or) efficiency of gain in finishing pigs. However, we also reported that increased amounts of pellet fines reduced the effects of pelleting diets. Other data from our laboratory indicated that wet/dry feeders improved rate and(or) efficiency of growth in finishing pigs fed a meal diet, and that pellet quality might be of lesser significance when a wet/dry feeder is used. Thus, we designed an experiment to determine the effects of pellet quality in pigs fed from wet/dry feeders.

Effects of expanding and pelleting diets on finishing pigs fed from wet/dry feeders

Pigs fed pelleted and expanded diets from wet/dry feeders had 4.4% greater ADG and 7.9 % greater efficiency of gain than pigs fed a mash diet. Also, trends for greater efficiencies of gain occurred among pigs fed expanded pellets vs standard pellets and expandate vs expanded pellets.; Swine Day, Manhattan, KS, November 16, 2000

Expander processing conditions affect nutrient digestibility in finishing pigs fed corn-, sorghum-, wheat-, and wheat midds-based diets

This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1998 Kansas State University Agricultural Experiment Station and Cooperative Extension Service.

Effects of removing vitamin and mineral premixes on growth performance and carcass measurements in finishing pigs

Previous experiments at Kansas State University demonstrated that omitting vitamin and trace mineral premixes from diets in late finishing had no negative effects on growth performance, carcass measurements, or meat quality. However, questions have surfaced about application of this concept in situations of greater stocking densities, larger pen sizes, and less uniform weight within the pens of pigs. Thus, the objective of the experiment reported herein was to determine the effects of omitting vitamin and mineral premixes in late finishing with “commercialtype” housing and management.

Effects of vitamins and mineral proteinates on growth performance and pork quality in finishing pigs.

From 185 to 225 lb BW, no differences in ADG, ADFI, or F/G occurred among pigs fed diets without or with vitamin and trace mineral premixes. Then, from 225 to 266 lb BW, a special premix with megadoses of vitamin E, vitamin C, Mg-proteinate, and Feproteinate was added to the diets of half the pigs given the previous treatments. Growth performance was not different among pigs fed diets without vitamin or with the KSU and special vitamin and mineral premixes. Also, meat quality (color, marbling, and firmness scores; drip, thawing, and cooking losses; shear force; and Hunter L*a*b*) was not affected by inclusion of the KSU and special vitamin and mineral premixes.

Variation in the digestiility of amino acids in soybean meal from a single processing plant.

Digestibilities of amino acids among samples of soybean meal (SBM) collected during a fall harvest season (4 collections made 15 d apart) were similar, except that true digestibility from tryptophan was lower for a sample collected on d 30 of the experiment vs SMB samples collected on the other dates. Our data suggest that proximate components and amino acid digestibilities of the SBM were very consistent and uniform during the 45 d of sample collection in one processing plant.

Effects of dietary electrolyte balance on sow and litter performance, blood chemistry, and urine chemistry in lactating sows.

Dietary electrolyte balance is calculated as the sum of Na and K minus Cl and is expressed in mEq/kg of diet. The manipulation of dietary electrolyte balance (dEB) to enhance lactation and reproductive performance in dairy cattle and laying hens is not a new concept. However, the effects of dEB on reproduction and lactation in sows have not been elucidated. Thus, our objective for the experiments reported herein was to determine the impact of dEB on performance of lactating sows and their litters.