The Value of Different Levels of Streptomycin-Sulfaquinoxaline and Chlortetracycline (Aureomycin) for Growing Pigs

Results of previous experiments at this station and elsewhere indicated that several of the antibiotics caused increases in daily gain of growing pigs. High level (50-100 grams per ton) antibiotic feeding has resulted in an increase in feed efficiency in trials conducted here the past two years. During the past year two experiments were conducted to compare feeding different levels of a mixture of streptomycin-sulfaquinoxaline and chlortetracycline. The first experiment was conducted during the winter of 1956-57and the second experiment during the summer of 1957

The Effect of Vitamin D in Rations for Growing Pigs Fed in the Absence of Direct Sunlight

Previous to this experiment two trials were conducted here that did not indicate a need for supplemental vitamin D for growing pigs fed in the absence of direct sunlight. In these previous trials a complete mixed ration containing recommended amounts of calcium and phosphorus was fed. The experiment reported here was conducted to see if supplemental vitamin D was required for growing pigs in the absence of sunlight when a mineral supplement was fed free-choice as cell as when a complete mixed ration was fed

Vitamins, Trace Minerals and Feed Additives

Although natural feedstuffs supply varying amounts of most of the vitamins and trace minerals, practical diets for swine are generally supplemented with certain of these nutrients. This article will discuss those vitamins and trace minerals that need more attention in swine feeding and feed additives that are used for growth promotion

Winter Dry-Lot Supplements for Growing Pigs

Research conducted at South Dakota in 1955-56 has shown that 10 to 19 per cent of ground alfalfa hay in a protein supplement will decrease the consumption of the supplement (S. Dak. Farm and Home Research, Feb. 1957). This resulted in a lowering of the feed cost per unit of pig gain. The objectives of this experiment were to compare three levels (10, 20 and 30 per cent) of ground alfalfa hay in a protein supplement and to compare these supplements fed free-choice to a complete mixed ration

Protein Supplements for Growing Pigs in Dry-Lot

During the past three years ground alfalfa hay has been used at this station in protein supplements for growing pigs, to reduce protein consumption. Previous trials have shown that levels of from 19 to 30 per cent alfalfa in protein supplements results in satisfactory consumption and gains. This experiment was conducted to compare various levels of soybean oil meal and tankage in supplement\u27s containing 19 to 30 per cent ground alfalfa hay

Arsenicals for Growing-Finishing Swine

The effects of feeding growing pigs the arsenicals arsanilic acid and 3-nitro- 4-hydroxyphenylarsonic acid have been reported by several research workers. It has also been suggested that these compounds might decrease the back fat of hogs. The purpose of this experiment was to compare the response of pigs to the above two arsenicals and also to another arsenical, arsenosobenzene. The effect of these compounds on carcass value, especially backfat thickness, was also determined

Thyroactive Compounds for Growing Pigs

Thyroactive compounds are compounds that contain thyroxine activity. Thyroxine is one of the natural hormones secreted by the thyroid gland. An overactive gland speeds up metabolism, increases the requirements for nutrients and increases growth rate in some species. These trials were conducted to determine if some of the thyroactive compounds could be fed at levels that would stimulate growth rate without causing any harmful effects

Antibiotics for Growing-Finishing Swine

Studies conducted at this Station and at other experiment stations have demonstrated the beneficial effects of antibiotics in swine rations. Aureomycin (chlortetracycline), terramycin (oxytetracycline) and penicillin have all given good results in swine feeding trials. Recently zinc bacitracin has been shown to be of benefit in some swine trials and erythromycin has been reported to increase gains in poultry more than other antibiotics. This experiment was conducted to determine the value of some of the newer antibiotics in comparison with terramycin when fed to growing pigs