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Full-Text Articles in Animal Sciences
Nebraska Competitive Livestock Marketing Act, J. David Aiken
Nebraska Competitive Livestock Marketing Act, J. David Aiken
Nebraska Swine Reports
LB835, the Nebraska Competitive Livestock Marketing Act, was adopted in 1999. The act regulates marketing and livestock ownership for packers slaughtering 150,000 or more animal units per year (150,000 steers, 350,000 calves up to 450 pounds, or 750,000 hogs). The act regulates packer livestock ownership, hog and cattle purchases and contracts, and livestock price reporting. The restrictions differ between hog and cattle purchases, but the price-reporting requirements are the same in both cases. Price-reporting requirements go into effect Feb. 15, 2000. There is some disagreement regarding when other provisions of the act take effect. LB835 took effect May 27, 1999. …
Effect Of Wean-To-Finish Management On Pig Performance, Mike Brumm, Angela K. Baysinger, Robert W. Wills, Edgar T. Clemens, Robert C. Thaler
Effect Of Wean-To-Finish Management On Pig Performance, Mike Brumm, Angela K. Baysinger, Robert W. Wills, Edgar T. Clemens, Robert C. Thaler
Nebraska Swine Reports
An experiment consisting of three trials was conducted to determine the effect of wean-to-finish management systems on pig performance. Treatments consisted of: 1) wean-to-finish single stock (WF) at 7.5 ft2/pig from weaning (17 day mean age) to slaughter in a fully slatted finishing facility; 2) double stock (DS) at 3.75 ft2/pig for eight weeks following weaning and then split into two pens at 7.5 ft2/pig each; and 3) nursery (NF) at 3.75 ft2/ pig for eight weeks in a conventional nursery followed by movement to the finisher and stocked at 7.5 ft …
2000 Nebraska Swine Report
Nebraska Swine Reports
Articles:
Pubertal Response in Gilts to Type and Frequency of Boar Exposure and as Influenced by Genetic Line and Age at Initiation of Boar Contact
Candidate Reproductive Genes Do Not Explain Responses in Lines Selected for Ovulation Rate and Litter Size
The Effect of Oxytocin at the Time of Insemination on Reproductive Performance — A Review
Extruded-Expelled Soybean Meal for Pigs
The Effects of Dietary Feather Meal Concentration and Space Allocation on Performance and Carcass Characteristics of Barrows
A Review of the Ammonia Issue and Pork Production
Nitrogen Balance and Growth Trials With Pigs Fed Low-Crude Protein, Amino Acid-Supplemented Diets …
District Court Rules In Progress Pig Case, J. David Aiken
District Court Rules In Progress Pig Case, J. David Aiken
Nebraska Swine Reports
Article 8 §12 of the Nebraska Constitution (popularly referred to as Initiative 300) establishes several requirements for corporations to legally qualify as family farm or ranch corporations in Nebraska. Under one requirement, a majority of the family farm or ranch corporation’s shareholders must be family members, “at least one of whom is a person residing on or actively engaged in the day to day labor and management of the farm or ranch.” On Sept. 16, 1998, Otoe County District Court Judge Ronald Reagan ruled in Hall v. Progress Pig that where no family member resides on the farm or ranch, …
A Review Of The Ammonia Issue And Pork Production, Janeth Colina, Austin Lewis, Phillip S. Miller
A Review Of The Ammonia Issue And Pork Production, Janeth Colina, Austin Lewis, Phillip S. Miller
Nebraska Swine Reports
During the last few decades, an increasing interest in, and respect for, the environment has arisen. This has consequences for livestock production. Air can become polluted by noxious odors from animal husbandry. A particular example is odor emission from pig buildings, because in several parts of the world pig production has become highly specialized, industrialized and concentrated geographically. Air quality in pig facilities, as it influences the well-being of animals and workers, has become a major concern for pork producers. Odors emanating from pig slurry are an increasing source of environmental pollution as well as a nuisance to the human …
Nitrogen Balance And Growth Trials With Pigs Fed Low-Crude Protein, Amino Acid-Supplemented Diets, Jose Figueroa, Austin Lewis, Phillip S. Miller
Nitrogen Balance And Growth Trials With Pigs Fed Low-Crude Protein, Amino Acid-Supplemented Diets, Jose Figueroa, Austin Lewis, Phillip S. Miller
Nebraska Swine Reports
To find out why low-crude protein, amino acid-supplemented diets often reduce growing pig performance, we conducted two experiments. In the first experiment, a nitrogen balance trial, three standard corn-soybean meal diets and three corresponding low-crude protein, amino acid-supplemented diets were used. The diets were: 14% CP and 10% CP + AA, 16% CP and 12% CP + AA, and 18% CP and 14% CP + AA, fed to 12 (90 lb) gilts in three periods of 7 d each. The amino acids lysine, tryptophan, threonine and methionine were added to low-crude protein diets to reach the same total amount as …
The Effects Of Compensatory Growth And Form Of Amino Acid Supply On Plasma Urea Concentration, Organ Weights And Carcass Characteristics In Gilts, Robert Fischer, Phillip S. Miller, Austin Lewis
The Effects Of Compensatory Growth And Form Of Amino Acid Supply On Plasma Urea Concentration, Organ Weights And Carcass Characteristics In Gilts, Robert Fischer, Phillip S. Miller, Austin Lewis
Nebraska Swine Reports
An experiment was conducted to examine the effects of compensatory growth and amino acid supply on plasma urea concentration, organ weights and carcass characteristics. Gilts were fed either a corn-soybean meal diet or a corn-soybean meal diet supplemented with crystalline lysine. Pigs were randomly allotted to either a 21-day ad libitum eating period or a 42-day restricted-realimentated feeding period. The restricted-realimentated feeding period consisted of a 21-day restriction period and a 21-day ad libitum eating period (realimentation). During the restriction period, pigs were fed to maintain body weight. During week one of the ad libitum period, gilts in the restricted-realimentated …
The Use Of Plasma Urea As An Indicator Of Protein Status In Growing-Finishing Pigs, Robert Fischer, Phillip S. Miller, Austin J. Lewis
The Use Of Plasma Urea As An Indicator Of Protein Status In Growing-Finishing Pigs, Robert Fischer, Phillip S. Miller, Austin J. Lewis
Nebraska Swine Reports
An experiment is being conducted on commercial swine operations to determine if plasma urea concentration can be used as an indicator of protein status in growing-finishing pigs. Swine producers in Eastern Nebraska are being selected to participate in this on-farm study. The experiment includes the completion of a 30-question survey and an on-farm visit for the collection of blood and feed samples. The survey includes questions about genetics, nutrition, housing and health. Preliminary results suggest that crude protein is overfed in most finishing diets. Gilts consistently have lower plasma urea concentrations than barrows when gilts and barrows are fed the …
The Investigation Of Betaine As A Growth Promotor And/Or Carcass Modifier And The Efficacy Of Betaine To Replace Methionine In Finishing Diets, Steven J. Kitt, Phillip S. Miller, Austin J. Lewis, Robert Fischer
The Investigation Of Betaine As A Growth Promotor And/Or Carcass Modifier And The Efficacy Of Betaine To Replace Methionine In Finishing Diets, Steven J. Kitt, Phillip S. Miller, Austin J. Lewis, Robert Fischer
Nebraska Swine Reports
Dietary betaine’s effect on growth performance and carcass composition of finishing barrows was investigated. Two experiments were conducted to assess whether betaine improves growth and/or carcass characteristics. In the first experiment, barrows were fed either a control diet or a diet supplemented with betaine and were either crowded or not crowded. Shoulder weight was increased in pigs fed betaine. Generally, betaine had no effect on growth performance and carcass characteristics. The second experiment attempted to assess whether betaine can replace methionine in finishing diets. Betaine tended to be associated with increased fat-free lean gain. This experiment failed to show that …
The Effect Of Oxytocin At The Time Of Insemination On Reproductive Performance — A Review, Donald G. Levis
The Effect Of Oxytocin At The Time Of Insemination On Reproductive Performance — A Review, Donald G. Levis
Nebraska Swine Reports
Oxytocin is released from the brain of the sow at the time of mating in response to stimulation by the boar. It is assumed that it enhances sperm transport to the oviduct. Several investigators have studied whether injecting oxytocin into semen before artificial insemination improves farrowing rate and litter size. The conclusions from review of these studies are: 1) Adding 4 to 5 IU’s of oxytocin to a dose of semen improves farrowing rate and litter size; 2) Use of oxytocin-treated semen is more effective in multiparous sows than gilts; 3) During the summer months, oxytocin-treated semen significantly increased farrowing …
Candidate Reproductive Genes Do Not Explain Responses In Lines Selected For Ovulation Rate And Litter Size, Regina Linville, Daniel Pomp, Rodger K. Johnson
Candidate Reproductive Genes Do Not Explain Responses In Lines Selected For Ovulation Rate And Litter Size, Regina Linville, Daniel Pomp, Rodger K. Johnson
Nebraska Swine Reports
Molecular technologies have developed rapidly and provide methods to select directly for genes controlling economic traits. The swine genetic linkage map is the most highly developed of all livestock species. Positions on the chromosomes of several genes are known. Some of these genes have been shown to have direct effects on economic traits. Selection lines that differ from the control line by as much as 50% in ovulation rate and litter size exist at Nebraska. This experiment evaluated whether six specific genes that produce important proteins in reproductive processes explained responses in ovulation rate and litter size in two of …
Acylation Stimulating Protein: A Potential Regulator Of Fat Synthesis, Jess L. Miner, Carin Ramsel, Sheila Jacobi
Acylation Stimulating Protein: A Potential Regulator Of Fat Synthesis, Jess L. Miner, Carin Ramsel, Sheila Jacobi
Nebraska Swine Reports
The long term goal of this project is to understand the molecular mechanisms controlling fat synthesis. These experiments indicate that acylation stimulating protein (ASP) can stimulate the incorporation of fatty acids into lipid in cultured adipose tissue. This finding justifies a future effort to determine if manipulation of ASP can modify fat deposition.
Extruded-Expelled Soybean Meal For Pigs, Duane Reese, Larry L. Bitney
Extruded-Expelled Soybean Meal For Pigs, Duane Reese, Larry L. Bitney
Nebraska Swine Reports
A review of the value of extruded-expelled soybean meal (ESBM) for pigs was conducted. Results from two studies where the growth performance of weanling pig was evaluated suggested that the feeding value of ESBM relative to solvent-extracted soybean meal (SSBM) is not consistent. The economic value of ESBM relative to SSBM was estimated from pig performance data and the metabolizable energy content of corn, ESBM, and SSBM. When ESBM is used to replace 44% CP SSBM in growing-finishing pig diets, it is worth 0 to $36.29 per ton more than 44% CP SSBM, assuming 44% CP SSBM and corn cost …
The Effects Of Dietary Feather Meal Concentration And Space Allocation On Performance And Carcass Characteristics Of Barrows, Kuo-Wei Ssu, Mike Brumm, Phillip S. Miller, Robert L. Fischer
The Effects Of Dietary Feather Meal Concentration And Space Allocation On Performance And Carcass Characteristics Of Barrows, Kuo-Wei Ssu, Mike Brumm, Phillip S. Miller, Robert L. Fischer
Nebraska Swine Reports
An experiment was conducted to determine the effect of dietary feather meal (FM, 0 and 20% ) and space allocation (8.3 [UC] and 6.2 [C] ft2/ pig) on growth and carcass characteristics of barrows. Control barrows (0% FM and UC) had 10% higher ADFI than gilts (0 % FM and UC), but only 2.6% greater ADG. Crowded barrows fed 20% FM diet from 165 lb to slaughter had decreased ADG and ADFI compared to control barrows. Crowded barrows fed a diet with no FM had a 4.9% reduction in ADFI compared to control barrows, and crowded barrows fed …
Duration Of Prrs Virus Infections And Proportion Of Persistently Infected Pigs, R. W. Wills, Alan R. Doster, J. Galeota, J.-H. Sur, Fernando A. Osorio
Duration Of Prrs Virus Infections And Proportion Of Persistently Infected Pigs, R. W. Wills, Alan R. Doster, J. Galeota, J.-H. Sur, Fernando A. Osorio
Nebraska Swine Reports
The objective of this study was to more fully characterize persistent PRRSV infections in swine. Twenty-eight 35-day-old segregated-early-weaned pigs were inoculated intranasally with PRRSV. Serum and tonsil biopsy samples were collected on days 0, 7, 14, 28, and then about monthly thereafter until day 251 post inoculation (PI). Virus was isolated from serum and tonsil biopsy samples through days 28 and 56 PI, respectively. Viral RNA was detected in serum and tonsil biopsy samples by RT-PCR through day 251 PI, although no positive serum samples were detected on days 84-196 PI. Greater proportions of day 28 and 56 PI serum …
Pubertal Response In Gilts To Type And Frequency Of Boar Exposure And As Influenced By Genetic Line And Age At Initiation Of Boar Contact, Dwane R. Zimmerman, Thomas Mcgargill, Dan Cheleen
Pubertal Response In Gilts To Type And Frequency Of Boar Exposure And As Influenced By Genetic Line And Age At Initiation Of Boar Contact, Dwane R. Zimmerman, Thomas Mcgargill, Dan Cheleen
Nebraska Swine Reports
The effectiveness of twice daily (2x) vs once daily (1x) boar exposure (BE) and the possible interaction of frequency of BE with type of BE (physical, PBE vs fence-line, FBE) was evaluated in two genetic lines of the Gene Pool population (AP, selected for early age at puberty and RLS, composite of genetic lines selected for ovulation rate or litter size) differing in average pubertal age and in RLS gilts at two different ages (130 and 154 d). Gilts from the RLS line (n=128) were allotted randomly, within litter, to once or twice daily BE, PBE or FBE and to …
Changes In Ph Of Boar Semen Extenders, Mary Sue Newth, Donald G. Levis
Changes In Ph Of Boar Semen Extenders, Mary Sue Newth, Donald G. Levis
Nebraska Swine Reports
An experiment was conducted to examine the change in pH across time of five extenders (MR-A, VSP, BTS, Merck III and SpermAid). Type of extender and time of measurement affected (P < .01) the overall pH of liquid extender; however an interaction (P < .01) occurred between type of extender and time. BTS and MERCK III had a small increase in pH across time, MR-A and VSP had a linear increase in pH across time and SpermAid decreased in pH during the first 20 minutes before gradually increasing to a consistent level of pH at 50 minutes after preparation. Boar semen extenders do not have the same pattern of pH change across time. Semen should not be mixed with extender until a stable pH has been reached. In general, a liquid boar semen extender should be prepared 60 to 90 minutes prior to mixing with raw semen.
Development And Use Of Pork Skin Fat Emulsion Gels In Low-Fat, High-Added-Water Bologna, Timothy D. Schnell, Roger W. Mandigo
Development And Use Of Pork Skin Fat Emulsion Gels In Low-Fat, High-Added-Water Bologna, Timothy D. Schnell, Roger W. Mandigo
Nebraska Swine Reports
Reduced-lean pork trimmings (~70 percent fat and 30 percent lean) have low economic value due to inherent high fat content. Mechanically modified pork skin was used to extend reduced- lean pork trimmings by making a fat emulsion gel, lowering fat content by dilution in an attempt to increase the value of reduced lean trimmings. The first objective was to extend reduced-lean pork trimmings by creating a pork skin fat emulsion gel (FG) and to characterize and optimize the functionality of FG from combinations of pork skin, reduced-lean trimmings and added water (AW). The next objective was to incorporate the best …
Follicular Selection And Atresia In Gilts Selected For An Index Of High Ovulation Rate And High Prenatal Survival, Hui-Wen Yen, Rodger K. Johnson, Dwane R. Zimmerman
Follicular Selection And Atresia In Gilts Selected For An Index Of High Ovulation Rate And High Prenatal Survival, Hui-Wen Yen, Rodger K. Johnson, Dwane R. Zimmerman
Nebraska Swine Reports
Previously, we reported (See Yen et al., Nebraska Swine Report 1998) White Line gilts selected for an index of high ovulation rate and high prenatal survival (White Line-2, WL-2) maintained a larger pool of medium follicles (3 to 6.9 mm) during the early- to mid-follicular phase than randomly selected controls (White Line- 1, WL-1). The present study evaluated the health status of the medium follicles to determine whether WL-2 gilts maintain a healthier pool of medium follicles and are able to continue selection of ovulatory follicles later in the follicular phase to achieve their ovulation rate advantage (6.6 ova). Ovaries …
Growth And Carcass Responses Of Barrows Fed A Corn-Soybean Meal Diet Or Low-Protein Amino Acid-Supplemented Diets At Two Feeding Levels, Sergio Gomez, Phillip S. Miller, Austin Lewis, Hsin-Yi Chen
Growth And Carcass Responses Of Barrows Fed A Corn-Soybean Meal Diet Or Low-Protein Amino Acid-Supplemented Diets At Two Feeding Levels, Sergio Gomez, Phillip S. Miller, Austin Lewis, Hsin-Yi Chen
Nebraska Swine Reports
An experiment, with 39 barrows with high lean gain potential, was conducted to evaluate the growth responses of pigs fed a corn-soybean meal diet (CONTROL) and low-crude protein diets supplemented with crystalline lysine, threonine, tryptophan and methionine either on an ideal protein basis (IDEAL) or to a pattern similar to the control diet (AACON). In both cases the amino acid patterns were on a true ileal digestible basis. The initial and final body weights were 72.0 and 125.8 pounds. The diets were offered on an ad libitum basis or by feeding 80 percent of the ad libitum intake. Pigs were …
Zinc Oxide, With Or Without Carbadox, Stimulates Performance In Nursery Pigs, Hsin-Yi Chen, Austin J. Lewis, Phillip S. Miller
Zinc Oxide, With Or Without Carbadox, Stimulates Performance In Nursery Pigs, Hsin-Yi Chen, Austin J. Lewis, Phillip S. Miller
Nebraska Swine Reports
As part of a cooperative research study with several other Midwest universities, two experiments were conducted to evaluate the effects of high concentrations of zinc from zinc oxide in nursery diets. In the first experiment, the effects of adding various pharmacological concentrations of zinc as zinc oxide were tested. In the second experiment, the effects of both zinc and(or) carbadox additions to diets for weanling pigs were evaluated. Feeding pharmacological concentrations (2,000 to 3,000 mg/kg) of supplemental zinc from zinc oxide stimulated voluntary feed intake and weight gain of nursery pigs, but additive responses to carbadox (55 mg/kg) were not …
Bioavailability Of Iron In Iron Proteinates, Austin Lewis, Phillip S. Miller, Hsin-Yi Chen
Bioavailability Of Iron In Iron Proteinates, Austin Lewis, Phillip S. Miller, Hsin-Yi Chen
Nebraska Swine Reports
The bioavailability of the iron in two different sources of iron proteinate was compared with that in feedgrade iron sulfate (FeSO4•H2O). Pigs, which were iron deficient and anemic at weaning, were given diets with no supplemental iron or supplements, of iron sulfate or iron proteinate. During the three-week study, weight gain and hemoglobin increased as the iron supplementation increased. When hemoglobin repletion was compared, there were no significant differences between iron sulfate and either of the iron proteinate sources. These results indicate the iron in iron sulfate and the two iron proteinate sources were similar in …
Defining Swine Nutrient Requirements And Allowances—What Do The Numbers Mean?, Phillip S. Miller, Austin Lewis, Duane Reese, Mike Brumm
Defining Swine Nutrient Requirements And Allowances—What Do The Numbers Mean?, Phillip S. Miller, Austin Lewis, Duane Reese, Mike Brumm
Nebraska Swine Reports
Defining nutrient requirements or allowances is the first, and conceivably most important step, in developing a nutrition program for growing-finishing pigs. Understanding the terminology and underlying principles used to define nutrient requirements and allowances for pigs will help producers better evaluate their nutrition programs. This information will also enable producers to interface production outputs (e.g., growth rate and carcass data) to published nutrient requirement and allowance programs, such as The National Research Council, Nutrient Requirements of Swine, 1998. As these and other approaches describing nutrient requirements for pigs develop, producers need a better and more complete understanding of growth biology …
The Effects Of Dietary Feather Meal Concentration On Performance And Carcass Characteristics Of Barrows, Kuo-Wei Ssu, Mike Brumm, Phillip S. Miller, Jill M. Heemstra
The Effects Of Dietary Feather Meal Concentration On Performance And Carcass Characteristics Of Barrows, Kuo-Wei Ssu, Mike Brumm, Phillip S. Miller, Jill M. Heemstra
Nebraska Swine Reports
An experiment was conducted to determine the effect of dietary feather meal level, as well as whether or not start weight influenced feather meal effects in growth performance and carcass traits of barrows. Dietary feather meal additions tended to decrease the final body weight variation of barrows. Barrows fed diets containing 20 percent feather meal from 80 pounds to slaughter had decreased average daily gain, average daily feed intake, digestible lysine intake, energy intake, daily lean gain and backfat depth. Barrows fed diets containing 10 percent feather meal from 190 pounds to slaughter had decreased average daily gain, average daily …
1999 Nebraska Swine Report
Nebraska Swine Reports
Reproduction
Changes in pH of Boar Semen Extenders
Follicular Selection and Atresia in Gilts for an Index of High Ovulation Rate and High Prenatal Survival
Health A Population Approach to Diagnosis of Grow-Finish Diarrhea Comlex
Survival of Pathogenic Intestinal Spirochetes Kept in Pure Cultures and in Pig Feces Held at Four Different Temperatures
Nutrition Feasibility of Growing and Feeding High-Oil Corn to Pigs
Bioavailability of Iron in Iron Proteinates
Zinc Oxide, With or Without Carbadox, Stimulates Performance in Nursery Pigs
The Effects of Dietary Feather Meal Concentration on Performance and Carcass Characteristics of Barrows
Defining Swine Nutrient Requirements and Allowances—What …
Survival Of Pathogenic Intestinal Spirochetes Kept In Pure Cultures And In Pig Feces Held At Four Different Temperatures, David E. S. N. Barcellos, Gerald Duhamel, Michelle R. Mathiesen
Survival Of Pathogenic Intestinal Spirochetes Kept In Pure Cultures And In Pig Feces Held At Four Different Temperatures, David E. S. N. Barcellos, Gerald Duhamel, Michelle R. Mathiesen
Nebraska Swine Reports
Porcine colonic spirochetosis (PCS) caused by Serpulina pilosicoli has been identified as a contributing cause of diarrhea and reduced performance of growing pigs in all major swine producing countries. The current view that transmission of PCS occurs through contamination of the environment by acutely or persistently infected pigs is based on the assumption that the spirochetes remain viable in the environment. The purpose of this study was to compare the viability of Serpulina pilosicoli kept in pure culture or mixed with feces at four different temperatures over time with that of Serpulina hyodysenteriae. The results of the present study indicated …
Feasibility Of Growing And Feeding High Oil Corn To Pigs, Larry L. Bitney, Duane Reese, Robert Caldwell
Feasibility Of Growing And Feeding High Oil Corn To Pigs, Larry L. Bitney, Duane Reese, Robert Caldwell
Nebraska Swine Reports
A feasibility analysis on the growing and feeding of high-oil corn (HOC) to pigs was conducted. The cost to produce HOC is about 25 to 32 cents per bushel higher than for normal corn (NC), primarily due to 7 to 10 percent yield reduction for HOC. Diets made with HOC contain between 1.5 and 3 percent additional fat. Therefore, feed efficiency should be improved, on average, by 3 to 6 percent when HOC is substituted for NC. In most cases, daily gain should improve by 0 to 3 percent with HOC in the diet. High-oil corn grown in central Nebraska …
Impact Of Drinker Type On Pig Performance, Water Use And Manure Production, Mike Brumm, Jill Heemstra
Impact Of Drinker Type On Pig Performance, Water Use And Manure Production, Mike Brumm, Jill Heemstra
Nebraska Swine Reports
A summer experiment was conducted to examine the impact of drinker design on pig performance, water use and manure volume. Pigs with access to Drik-O-Mat® bowl drinkers had similar daily gains, lower feed intake and improved feed conversion compared to pigs with access to a WaterSwing® nipple drinker. Water use was reduced 24.8 percent for the bowl versus swing drinkers. Manure volume was reduced 21.6 percent for the bowl versus swing drinker. The difference in manure volume is most likely due to a reduction in water wastage. Selection of drinker devices must include consideration of the manure system design and …
Pork 101 A Short Course Focusing On The Importance Of Pork Quality And Consistency, Dennis E. Burson, Dana J. Hanson
Pork 101 A Short Course Focusing On The Importance Of Pork Quality And Consistency, Dennis E. Burson, Dana J. Hanson
Nebraska Swine Reports
As we move towards the next century, pork producers face many challenges. The Pork Quality Audit in 1994 identified consistency of the meat product, meat quality and food safety as major issues producers can’t afford to ignore.
To introduce participants to these important segments of the pork industry, a three-day, hands-on short course has been developed at the University of Nebraska, with the assistance of the American Meat Science Association, the National Pork Producers Council, Michigan State University and Texas A&M University.
Response To Increasing Levels Of Nutrients Fed During Gestation And Lactation To Control And Prolific Gilts, David Casey, Rodger K. Johnson
Response To Increasing Levels Of Nutrients Fed During Gestation And Lactation To Control And Prolific Gilts, David Casey, Rodger K. Johnson
Nebraska Swine Reports
Normal diets and diets with 50 percent greater amounts of protein, vitamins and certain minerals were fed during the gilt development period through lactation to gilts of lines that differed in litter size. The lines had been developed with 10 generations of genetic selection that resulted in a difference between the prolific line and a randomly selected control line of 2.9 fully formed pigs at birth in first parity sows. However, the large litter size line also had greater numbers of stillborn pigs, smaller pigs at birth and greater pre-weaning mortality. The purpose of the experiment was to determine whether …