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Kansas Agricultural Experiment Station Research Reports

1984

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Full-Text Articles in Life Sciences

Effect Of Particle Size And Surface Area Of Corn On Pig Performance And Nutrient Digestibility (1984), Jih-Fang Wu, G L. Allee Jan 1984

Effect Of Particle Size And Surface Area Of Corn On Pig Performance And Nutrient Digestibility (1984), Jih-Fang Wu, G L. Allee

Kansas Agricultural Experiment Station Research Reports

Two feeding trials and two digestion trials were conducted to evaluate the effects of particle size and surface area of corn on the performance and nutrient digestibility of weaning and finishing pigs. The effects of particle size on production rate and grinding efficiency also were evaluated. Production rate and grinding efficiency decreased as particle size decreased. Average daily gain was not influenced by particle size. Feed intake tended to decrease as particle size decreased with the lowest feed intake on the fine partice size diet. Feed efficiency tended to improve as particle size decreased. The incidence of ulceration in the …

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Time-Restricted Feeding Of Pigs: Social And Feeding Behavior (1984), J Vargas Vargas, J V. Craig, Robert H. Hines Jan 1984

Time-Restricted Feeding Of Pigs: Social And Feeding Behavior (1984), J Vargas Vargas, J V. Craig, Robert H. Hines

Kansas Agricultural Experiment Station Research Reports

Twenty finishing pigs were used to evaluate effects of time-restricted feeding on social interactions and feeding patterns of pigs at feeding time. Correlation analysis for pairs of traits, involving feeding activities, social interactions, and rate of gain indicate that more aggressive pigs went first to the feeder, fed more frequently, and gained faster. Although on continuous artificial lighting, timed-fed pigs displayed more feeding and aggressive behavior during day light hours.; Swine Day, Manhattan, KS, November 15, 1984

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Effect Of Reduced Nighttime Temperature On Nursery Pig Performance (1984), David A. Nichols, Frank Blecha, M Johnston, Robert H. Hines Jan 1984

Effect Of Reduced Nighttime Temperature On Nursery Pig Performance (1984), David A. Nichols, Frank Blecha, M Johnston, Robert H. Hines

Kansas Agricultural Experiment Station Research Reports

A total of 144 weaned pigs were used to evaluate the effect of reduced nighttime temperatures on pig performance. No differences were observed in average daily feed intake, daily gain, or feed efficiency regardless of temperature treatment. These results indicate that constant high temperature may not be required for nursery pigs.; Swine Day, Manhattan, KS, November 15, 1984

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Performance Of Young Pigs Fed Sorghum Grain Damaged By Lesser Grain Borer Or Fungal Invasion (1984), J C. Dietz, Keith C. Behnke, C W. Deyoe, G L. Allee Jan 1984

Performance Of Young Pigs Fed Sorghum Grain Damaged By Lesser Grain Borer Or Fungal Invasion (1984), J C. Dietz, Keith C. Behnke, C W. Deyoe, G L. Allee

Kansas Agricultural Experiment Station Research Reports

Nutritional quality and physical conditions were used to evaluate grain sorghum damaged by either the lesser grain borer Rhyzopertha dominica (F.) or by nontoxin-producing fungi. Experimental treatments were: 1) control 04.0% moisture), 2) lesser grain borer (LGB) (14% moisture with initial infestation of 4.5 adults/lb of grain) and 3) fungal (Fungal) (15.5% moisture). Control grain was used to formulate a 17% crude protein diet. The remaining dietary treatments were formulated by replacing the control grain with the two damaged grains on a weight basis. Forty-five female Yorkshire and 12 crossbred male pigs, with an average initial weight of 22 lb …

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Digestibility Of Fat Sources By Sows (1984), S Christianson, G L. Allee, D S. Pollmann Jan 1984

Digestibility Of Fat Sources By Sows (1984), S Christianson, G L. Allee, D S. Pollmann

Kansas Agricultural Experiment Station Research Reports

Twelve crossbred sows averaging 337 lb were used to determine apparent nutrient digestibility of three fat sources. Fat sources evaluated were soybean oil, a 85% dry-fat product composed of animal and vegetable fat, and a 80% dry- fat product made with casein encapsulated choice white grease. The control diet was a 13.0% crude protein corn-soybean diet with 8% cornstarch. Fat sources were added to the control diet to supply 8% added fat. The 12 sows were used in a crossover design, with three sows per diet in each of two periods. Each period consisted of a 5-day adjustment and a …

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Cellular Immune Responses In Artificially Reared Pigs (1984), Frank Blecha, D S. Pollmann, E F. Kluber Iii Jan 1984

Cellular Immune Responses In Artificially Reared Pigs (1984), Frank Blecha, D S. Pollmann, E F. Kluber Iii

Kansas Agricultural Experiment Station Research Reports

An experiment was conducted to determine the influence of artificial rearing on the cellular immune response of young pigs. Artificially reared pigs had lower cellular immune reactivity than sow-reared controls. These results indicate that artificial rearing may result in immunosuppression in young pigs.; Swine Day, Manhattan, KS, November 15, 1984

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Performance Of Young Pigs Fed Sorghum Grain Damaged By Lesser Grain Borer Or Fungal Invasion (1984), J C. Dietz, Keith C. Behnke, C W. Deyoe, G L. Allee Jan 1984

Performance Of Young Pigs Fed Sorghum Grain Damaged By Lesser Grain Borer Or Fungal Invasion (1984), J C. Dietz, Keith C. Behnke, C W. Deyoe, G L. Allee

Kansas Agricultural Experiment Station Research Reports

Nutritional quality and physical conditions were used to evaluate grain sorghum damaged by either the lesser grain borer Rhyzopertha dominica (F.) or by nontoxin-producing fungi. Experimental treatments were: 1) control 04.0% moisture), 2) lesser grain borer (LGB) (14% moisture with initial infestation of 4.5 adults/lb of grain) and 3) fungal (Fungal) (15.5% moisture). Control grain was used to formulate a 17% crude protein diet. The remaining dietary treatments were formulated by replacing the control grain with the two damaged grains on a weight basis. Forty-five female Yorkshire and 12 crossbred male pigs, with an average initial weight of 22 lb …

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Creep Feeding And Phytohemagglutinin Skin-Test Responses In Pigs (1984), Frank Blecha, D S. Pollmann, D M. Vanwormer Jan 1984

Creep Feeding And Phytohemagglutinin Skin-Test Responses In Pigs (1984), Frank Blecha, D S. Pollmann, D M. Vanwormer

Kansas Agricultural Experiment Station Research Reports

An experiment was conducted to determine the influence of creep feeding on cellular immunity in young pigs. Creep feeding from 10 days of age to weaning did not influence phytohemagglutinin skin-test responses.; Swine Day, Manhattan, KS, November 15, 1984

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Litter Size In Gilts After Altrenogest And Flushing (1984), Duane L. Davis, Jeffrey S. Stevenson, D S. Pollmann, G L. Allee Jan 1984

Litter Size In Gilts After Altrenogest And Flushing (1984), Duane L. Davis, Jeffrey S. Stevenson, D S. Pollmann, G L. Allee

Kansas Agricultural Experiment Station Research Reports

Effects of estrous synchronization and flushing on litter size in gilts were compared on two farms. Estrus in gilts was synchronized with altrenogest for 14 days or estrous cycles were left unaltered (control group). One-half of the synchronized gilts were flushed by feeding supplemental ground milo (3.4 lb) in addition to 4 lb of a basal milo-soybean meal diet that all gilts received. Additional milo was provided from day 8 of altrenogest treatment until the first day of estrus. Response on the two farms differed. Altrenogest-treated gilts from one farm farrowed about one more pig than controls, regardless of whether …

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Effect Of Insecticide Impregnated Ear Tags On Horn Fly Populations And Suckling Calf Performance (1984), D. Simms, T. Willman, R. Schalles Jan 1984

Effect Of Insecticide Impregnated Ear Tags On Horn Fly Populations And Suckling Calf Performance (1984), D. Simms, T. Willman, R. Schalles

Kansas Agricultural Experiment Station Research Reports

Three trials were conducted to determine the effect of insecticide impregnated ear tags on horn fly counts and weight gain of suckling calves. In trials 1 and 2, cow calf pairs on two Kansas ranches were assigned to these treatments: 1) Control - no tag, 2) Cows Only - 1 tag per cow, 3) Calf Only - 1 tag per calf, and 4) Cow and Calf - 1 tag each. Each tag treatment was in a separate pasture. All insecticide tag treatments reduced (P<.05) horn flies on cows and calves in July and August; however, by September the tags were only reducing (P<.05) flies on cows. While the weight gain response to tags was variable, when trials were combined, all tag treatments increased (P<.05) calf gains over controls. Using a single tag per cow was better (P<.05) than a single tag per calf, while tagging both the cow and calf was no better than either single tag treatment. Average fly counts for each pasture were negatively correlated with calf weight gains indicating a strong relationship between fly populations and calf performance. In trial 3, apparent horn fly resistance to the insecticide in the tags resulted in terminating the trial mid-summer. Research in Kansas and other states indicates that horn fly resistance to pyrethroid insecticides is becoming a common problem which means that producers may need to revert to previously used methods of horn fly control.

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Kansas Steer Futurities - The Record On Retained Ownership 1974-1983 (1984), C. Lambert, D. Simms, B. Schalles, L. Corah, Gerry L. Kuhl, M. Sands Jan 1984

Kansas Steer Futurities - The Record On Retained Ownership 1974-1983 (1984), C. Lambert, D. Simms, B. Schalles, L. Corah, Gerry L. Kuhl, M. Sands

Kansas Agricultural Experiment Station Research Reports

Spring born steer calves, weaned and delivered to custom feedlots by Kansas producers, were fed to slaughter weight. Gain and carcass information was gathered on over 5,000 head fed in 53 separate tests since the fall of 1974. Retaining ownership of steers through the feedlot phase has been profitable for producers in six of the last nine years, and in only two years have losses been large. Those same calves, if sold at weaning, would have been profitable in only three of the last nine years, using Kansas Farm Management Association average costs of production. The cattle averaged 59 percent …

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Feeding Bulls-A Practical Evaluation (1984), D. Simms, L. Corah, Gerry L. Kuhl, R. Schalles Jan 1984

Feeding Bulls-A Practical Evaluation (1984), D. Simms, L. Corah, Gerry L. Kuhl, R. Schalles

Kansas Agricultural Experiment Station Research Reports

Bull calves on nine Kansas ranches were either castrated and implanted with Ralgro, left intact and not implanted, or left intact and implanted with Ralgro, with performance evaluated through slaughter. Bulls produced leaner carcasses and gained slightly faster and more efficiently than steers. However, based on actual prices received, bulls returned $16.09 less to their owners than steers. Implanting with Ralgro during the suckling phase did not influence any of the traits measured. It is evident that marketing is a major problem which makes bull feeding risky

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Silo-Best® For Sorghum Silages (1984), K. Bolsen, H. Ilg, M. Hinds Jan 1984

Silo-Best® For Sorghum Silages (1984), K. Bolsen, H. Ilg, M. Hinds

Kansas Agricultural Experiment Station Research Reports

Silo-Best lowered the ensiling temperature and increased the dry matter recovered from the silo by over 5 percentage units (82.3 vs. 77.3%). Calves fed the control silage gained faster and consumed more feed, but those fed treated silage were slightly more efficient. The more efficient gain and lowered shrink loss for Silo-Best silage gave 6.4 extra pounds of calf gain per ton of crop ensiled.

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High Moisture Corn Ensiled With Urea For Cattle Finishing Rations (1984), B. Young, R. Smith, K. Bolsen, H. Ilg Jan 1984

High Moisture Corn Ensiled With Urea For Cattle Finishing Rations (1984), B. Young, R. Smith, K. Bolsen, H. Ilg

Kansas Agricultural Experiment Station Research Reports

Dry rolled corn, ensiled high moisture corn, and high moisture corn that was rolled and ensiled with urea or left whole and ensiled with urea were compared in two cattle trials. Dry corn gave the poorest cattle performance; rolled, ensiled high moisture corn gave the best. When corn was left whole, adding urea prior to ensiling increased dry matter losses in the silo and produced a butyric acid fermentation. Urea increased the bunk life of the ensiled high moisture corn.

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Silage Additive Update: 1984, K. Bolsen, M. Hinds, J. Brethour Jan 1984

Silage Additive Update: 1984, K. Bolsen, M. Hinds, J. Brethour

Kansas Agricultural Experiment Station Research Reports

Numerous commercial silage additives, whose manufacturers claim will improve silage quality, are available to Kansas farmers and ranchers. We believe that these claims must ultimately be documented with farm-scale research. To date, Manhattan and Ft. Hays farm-scale silo results clearly indicate that a few silage additives do improve silage quality and are cost-effective. Several of them have consistently reduced "in silo" losses. But results probably will not be favorable with all additives under every farm condition. Nor will research results obtained with one commercial product in our trials also apply to other products on the market, however similar in ingredient …

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Comparison Of Compudose With Ralgro Or Synovex-S Reimplant Programs For Finishing Steers (1984), S.B. Laudert, G.V. Jr. Davis Jan 1984

Comparison Of Compudose With Ralgro Or Synovex-S Reimplant Programs For Finishing Steers (1984), S.B. Laudert, G.V. Jr. Davis

Kansas Agricultural Experiment Station Research Reports

Finishing yearling steers reimplanted with Synovex-S or Ralgro gained 6.8 and 4.2% faster, respectively, than those implanted with Compudose. However, feed efficiency was not significantly different among treatments. Steers implanted with Compudose gained 5.1% faster and more efficiently than those implanted with a single Ralgro.

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Comparison Of Compudose®, Ralgro® And Synovex-C® For Suckling Steer Calves (1984), D.D. Simms, R. Schalles Jan 1984

Comparison Of Compudose®, Ralgro® And Synovex-C® For Suckling Steer Calves (1984), D.D. Simms, R. Schalles

Kansas Agricultural Experiment Station Research Reports

The comparative growth-promoting value of Compudose, Ralgro, Ralgro + Ralgro reimplant, and Synovex-C + Synovex-C reimplant was evaluated on five Kansas ranches with 674 suckling steer calves in seven trials conducted during 1982 and 1983. The Ralgro + Ralgro reimplant program increased gain significantly (P<.05) over controls, with an average improvement of 3.9%. Either a single Ralgro or Compudose implant at branding increased gain about 2.6%. Implanting with Synovex-C produced 1% improvement in gain.

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Toxicity Problems With Ammoniated Dry Roughages (1984), D. Simms, Gerry L. Kuhl, J. Brethour Jan 1984

Toxicity Problems With Ammoniated Dry Roughages (1984), D. Simms, Gerry L. Kuhl, J. Brethour

Kansas Agricultural Experiment Station Research Reports

In two trials conducted at the Fort Hays Experiment Station, symptoms of toxicity (hyperexcitability, circling, convulsions, death) were observed in several newborn calves (l to 14 days of age) nursing cows consuming ammoniated forage sorghum hay. None of these symptoms was observed in calves nursing cows consuming untreated hay. No toxicity symptoms were observed in the cows on any treatment. However, several instances of similar symptoms in cattle consuming ammoniated forages have been reported in growing calves and adult cattle in Kansas, Texas, California, and Kentucky. The primary forages involved in these incidents were forage sorghum, hybrid sudan, cereal grain, …

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Effects Of Low Voltage Electrical Stimulation During Bleeding On Characteristics Of Beef Loin Eye Top Round Muscles (1984), Donald H. Kropf, Melvin C. Hunt, John A. Unruh, Curtis L. Kastner, Michael E. Dikeman Jan 1984

Effects Of Low Voltage Electrical Stimulation During Bleeding On Characteristics Of Beef Loin Eye Top Round Muscles (1984), Donald H. Kropf, Melvin C. Hunt, John A. Unruh, Curtis L. Kastner, Michael E. Dikeman

Kansas Agricultural Experiment Station Research Reports

Low voltage electrical stimulation (ES) during bleeding and subsequent carcass chilling at 36 to 46° F resulted in 1) a more rapid pH decline 2) initial lighter red color, but more rapid discoloration during display 3) softer and coarser textured lean 4) reduced water holding capacity and juiciness and 5) decreased tenderness of the loin eye longissimus (LE) muscle when compared to the non-stimulated control (C) LE muscle. ES effects on top round semimembranosus (TR) muscle were limited to a more rapid pH decline and lower water holding capacity. Our results indicate that ES soon after slaughter, coupled with relatively …

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Effects Of Low Voltage Electrical Stimulation On Quality Characteristics Of Young Bulls Fed To 14, 16 And 18 Months Of Age (1984), D.G. Gray, John A. Unruh, Curtis L. Kastner, Michael E. Dikeman Jan 1984

Effects Of Low Voltage Electrical Stimulation On Quality Characteristics Of Young Bulls Fed To 14, 16 And 18 Months Of Age (1984), D.G. Gray, John A. Unruh, Curtis L. Kastner, Michael E. Dikeman

Kansas Agricultural Experiment Station Research Reports

Low voltage electrical stimulation of young bulls at 30 to 45 min after bleeding resulted in a lower muscle pH, higher marbling score, lighter cherry red color and reduced incidence of heat ring formation when compared to non-stimulated controls. Ribeye steaks from electrically stimulated sides were more tender than non-stimulated controls, but bottom round steaks were not different. Our results indicate that low voltage electrical stimulation, incorporated into a continuous slaughter operation as late as 30 to 45 min after bleeding, can improve USDA quality characteristics and tenderness of meat from young bulls.

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Lecithin Addition To Starter Pig Diets With And Without Added Fat And Whey (1984), D M. Van Wormer, D S. Pollmann Jan 1984

Lecithin Addition To Starter Pig Diets With And Without Added Fat And Whey (1984), D M. Van Wormer, D S. Pollmann

Kansas Agricultural Experiment Station Research Reports

A total of 316 crossbred weanling pigs were used in two studies to evaluate the effect of the addition of edible-grade, unbleached soy lecithin on growth in starter pig diets with and without added fat and/or dried whey. Addition of fat to a corn-soybean meal diet improved (P<.05) feed efficiency but addition of lecithin did not affect performance. When lecithin and fat were added in combination, average daily gain was less (P<.05) than for diets without added fat. This may be due to a high level of undigestible fat having a limiting effect on intake and consequently decreasing gains. A low level of lecithin (1.5%) in diets without whey gave approximately the same response as a 4% fat diet without whey thus making lecithin a possible fat substitute should, it be economically feasible.; Swine Day, Manhattan, KS, November 15, 1984

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Effects Of Compudose® Implants On Performance Carcass, Meat Quality Traits And Serum Testosterone In Young Boars (1984), T Timmis, Michael E. Dikeman, Melvin C. Hunt, G Highfill, Jeffrey S. Stevenson, Robert H. Hines Jan 1984

Effects Of Compudose® Implants On Performance Carcass, Meat Quality Traits And Serum Testosterone In Young Boars (1984), T Timmis, Michael E. Dikeman, Melvin C. Hunt, G Highfill, Jeffrey S. Stevenson, Robert H. Hines

Kansas Agricultural Experiment Station Research Reports

Implanting boar pigs at 100 lb with 24 mg of Compudose 200® (estradiol 17β) had no significant effect on "boar odor" in meat, rate of gain, feed efficiency, carcass leanness or meat quality traits. The presence of a 7 to 8 mo old gilt in the pen decreased rate of growth in both control and implanted boars, but contrary to our expectations did not increase the incidence of "boar odor".; Swine Day, Manhattan, KS, November 15, 1984

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Efficacy Of Ectrin® (Fenvalerate) For Sarcoptic Mange Control In Swine (1984), E L. Wooten, A B. Broce, D S. Pollmann Jan 1984

Efficacy Of Ectrin® (Fenvalerate) For Sarcoptic Mange Control In Swine (1984), E L. Wooten, A B. Broce, D S. Pollmann

Kansas Agricultural Experiment Station Research Reports

A trial was conducted to determine the efficacy of fenvalerate (Ectrin®) for control of sarcoptic mange mites in swine. Artificially infested pigs were treated with two sprayings of Ectrin at 0.05% concentration with 1 wk interval between sprayings. One week after the first spraying, mite numbers and clinical signs of mange had decreased in treated animals but remained elevated in infested-nontreated pigs. Four weeks after the first spraying (3 wk after the second spraying), no mites were found in scrapings from the Ectrin-treated pigs and the amount of scratching and rubbing in those pigs decreased compared with the infested- nontreated …

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Digestibility Of Fat Sources By Growing Pigs (1984), De-Fa Li, G L. Allee Jan 1984

Digestibility Of Fat Sources By Growing Pigs (1984), De-Fa Li, G L. Allee

Kansas Agricultural Experiment Station Research Reports

A digestion trial was conducted with 12 crossbred barrows averaging 48 lb to evaluate the digestibility of various fat sources. Fat sources evaluated were soybean oil, a 85% dry fat product composed of animal and vegetable fat, and a 80% dry fat product made by encapsulating choice white grease with casein. The control diet was a 18% crude protein corn-soybean meal diet with 10% cornstarch. Fat sources were added to the basal diet at the expense of cornstarch to supply 8% added fat. A crossover design was used with three pigs per diet in each of two periods. Digestibility of …

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Comparison Of Feeding Systems For Finishing Swine (1984), J Vargas Vargas, Robert H. Hines Jan 1984

Comparison Of Feeding Systems For Finishing Swine (1984), J Vargas Vargas, Robert H. Hines

Kansas Agricultural Experiment Station Research Reports

Two feeding trials using 240 finishing pigs were conducted to evaluate meal feeding and ad libitum dry and wet feeding. Growth rate was significantly improved by wet feeding in trial 1. Overall, a 5% improvement in growth rate occurred by wet feeding in both trials when compared with meal-feeding or ad libitum dry feeding. Feed efficiency was similar for pigs fed meals, and ad libitum dry or wet diets.; Swine Day, Manhattan, KS, November 15, 1984

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Methionine Addition To Weanling Pig Diets (1984), Tze-Chow Ong, G L. Allee Jan 1984

Methionine Addition To Weanling Pig Diets (1984), Tze-Chow Ong, G L. Allee

Kansas Agricultural Experiment Station Research Reports

Three growth trials and two metabolism trials utilizing 236 pigs were conducted to evaluate the effects of amino acids additions to weanling pig diets and to estimate the methionine requirement of weanling pigs using growth and nitrogen retention as criteria. From these results, it was concluded that the total sulfur amino acid requirement of weanling pigs does not exceed 0.56% of the diet. Addition of methionine to a lysine supplemented 18% protein corn or sorghum-soybean meal did not improve pig performance.; Swine Day, Manhattan, KS, November 15, 1984

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Lecithin Addition To Starter Pig Diets With And Without Added Fat And Whey (1984), D Van Wormer, D S. Pollmann Jan 1984

Lecithin Addition To Starter Pig Diets With And Without Added Fat And Whey (1984), D Van Wormer, D S. Pollmann

Kansas Agricultural Experiment Station Research Reports

A total of 316 crossbred weanling pigs were used in two studies to evaluate the effect of the addition of edible-grade, unbleached soy lecithin on growth in starter pig diets with and without added fat and/or dried whey. Addition of fat to a corn-soybean meal diet improved (P<.05) feed efficiency but addition of lecithin did not affect performance. When lecithin and fat were added in combination, average daily gain was less (P<.05) than for diets without added fat. This may be due to a high level of undigestible fat having a limiting effect on intake and consequently decreasing gains. A low level of lecithin (1.5%) in diets without whey gave approximately the same response as a 4% fat diet without thus making lecithin a possible fat substitute should, it be economically feasible.; Swine Day, Manhattan, KS, November 15, 1984

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Effects Of Source And Level Of Supplemental Energy On Reproductive Performance Of Sows (1984), S Christianson, G L. Allee, D S. Pollmann, Jim L. Nelssen Jan 1984

Effects Of Source And Level Of Supplemental Energy On Reproductive Performance Of Sows (1984), S Christianson, G L. Allee, D S. Pollmann, Jim L. Nelssen

Kansas Agricultural Experiment Station Research Reports

Three feeding trials utilizing 185 sows (149 primiparous and 36 multiparous) were conducted to evaluate the effects of feeding various levels and sources of supplemental energy during lactation and from weaning to rebreeding on sow reproductive performance. Sows fed tallow (5% or 10%) during lactation had reproductive performance similar to sows fed the basal milo-soybean meal diet. Ad libitum feed intake was not affected by the addition of tallow for either the last week of lactation or for the entire three week lactation. However, daily digestible energy (DE) intake was increased with the addition of tallow to diets. Survival rate …

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Fat In Late Gestation Sow Diets: Effects On Pig Survival And Growth (1984), G L. Allee, George A. Milliken, Jim L. Nelssen Jan 1984

Fat In Late Gestation Sow Diets: Effects On Pig Survival And Growth (1984), G L. Allee, George A. Milliken, Jim L. Nelssen

Kansas Agricultural Experiment Station Research Reports

An on-farm experiment was conducted utilizing 140 sows to compare the effect of feeding either fat or additional corn during late gestation on subsequent pig performance. Beginning on day 100 of gestation and until the day of farrowing, sows were fed 6 lb daily of a corn-soybean meal diet top-dressed with either 1 lb of fat or 2.25 lb of corn. Litter size was equalized within 24 hr of farrowing. Feeding fat to sows during late gestation increased (P<.05) the number of pigs weaned per litter by .4 pig compared to feeding additional corn. Sows fed supplemental fat during late gestation weaned heavier litters (P=.06) compared to sows fed extra corn. These results indicate that feeding fat during late gestation to sows with a high energy intake increased pig survival over that obtained when the same calories were provided with corn.; Swine Day, Manhattan, KS, November 15, 1984

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Successful Induction Of Estrus During Lactation For Sows Separated From Their Litters (1984), Jeffrey S. Stevenson, Duane L. Davis Jan 1984

Successful Induction Of Estrus During Lactation For Sows Separated From Their Litters (1984), Jeffrey S. Stevenson, Duane L. Davis

Kansas Agricultural Experiment Station Research Reports

Our objective was to determine the effectiveness of inducing estrus during lactation by temporarily separating the litter from the sow during the last week of lactation. Lactating sows were removed daily from their litters for either 1) 3 hr /day (n=20), 2) 6 hr /day (n=39), or 3) 12 hr /day (n=10) during the last 8 days of lactation and exposed to an intact boar for at least 1 hr during the separation period. Litters were weaned from control sows at either 2 (n=13) or 4 (n=15) weeks for comparison of intervals to estrus following complete weaning or temporary separation. …

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