Jason C Woodworth's research while affiliated with Kansas State University and other places
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Publications (72)
Calcium (Ca) and phosphorus (P) are minerals involved in biological functions and essential structural components of the skeleton. The body tightly regulates Ca and P to maintain homeostasis. Maternal needs for Ca and P increase during gestation and lactation to support conceptus growth and milk synthesis. Litter size and litter ADG have a large ef...
Two studies were conducted to evaluate the effects of sodium diformate in swine diets. For Exp. 1, 360 barrows (DNA 200 × 400; initially 5.9 ± 0.06 kg) were used in a 38-d study. At weaning, pigs were randomly assigned to pens with five pigs per pen. Each pen was allocated to one of six treatments with 12 pens per treatment. Treatments were formula...
A total of 2,160 pigs [337 × 1050, PIC; initial body weight (BW) = 33.2 ± 1.4 kg] were used in a 114-d trial to determine the effects of feeding diets differing in Ca:P ratio and added phytase or phytase and 25(OH)D3 (Hy-D, DM Nutritional Products, Parsippany, NJ) on growth performance, carcass characteristics, serum 25(OH)D3, and bone characterist...
Currently, the soybean processing industry has not fully characterized the composition or nutritional value of certain processing by-products (e.g., gums, phospholipid) and their effect on soybean meal (SBM) quality. Depending on the processing plant, soybean gums and soapstocks may be added back to SBM during manufacturing. There is potential for...
A total of 297 pigs (DNA 241 × 600; initial body weight = 8.64 ± 0.181 kg) were used in a 21-d trial to evaluate the effects of HiPhorius phytase (dm-firmenich, Parsippany, NJ) on pig growth performance and bone mineralization. All pigs were fed P depletion diets (0.09% aP) for a 3-d period before the start of the study (d 14 after weaning). Pens o...
With the recent Renewable Fuel Standard Program developed by the Environmental Protection Agency, soybean oil is expected to be in record demand by the fuel energy industry. As a result, there will be the potential opportunity for increased usage of soybean meal (SBM) in swine diets. Therefore, the objective of this study was to evaluate the effect...
A total of 320 barrows (DNA 241 × 600; initially 10.7 ± 0.21 kg) were used in a 21-d growth trial to determine the available P (aP) release curve for Microtech phytase (Guangdong VTR Bio-Tech Co, Ltd. Zhuhai, Guangdong, China). At approximately 21 d of age, pigs were weaned and randomly allocated to pens and fed a common diet for 18 d and then fed...
Feed mill decontamination is difficult because equipment is not designed to be cleaned with water. Alternate strategies may improve the ability of a mill to decontaminate in the event of viral contamination. The objective was to evaluate different decontamination strategies within a mill following the inoculation of porcine epidemic diarrhea virus...
Organic acids, such as formic acid, are commonly used as acidifiers in swine diets. Forms of formic acid include salts of sodium, calcium, or potassium. Previous research has shown positive results using potassium diformate in swine diets including improved nutrient digestibility, growth performance, and altered gut microbiota. Additionally, recent...
Two experiments were conducted to determine the effect of HiPhorius (dsm-firmenich, Parsippany, NJ) phytase on finishing pig growth performance, serum chemistry, bone mineralization, and carcass characteristics. In Exp. 1, 1,161 pigs (PIC 337 × 1050, initially 36.7 ± 0.48 kg) were used in a 105-d trial. There were 27 pigs per pen and 10 or 11 repli...
Two experiments were conducted to determine the effects of butyrin-based feed additives on nursery pig performance, fecal dry matter (DM), serum chemistry, and short chain fatty acid (SCFA) production. In Exp. 1, 250 pigs (initially body weight = 5.6 kg) were randomly allotted to 1 of 5 treatments. There were 5 pigs/pen and 10 replications/treatmen...
Incorporating pharmacological levels of Zn in nursery pig diets is a well-recognized practice for reducing post-weaning diarrhea, enhancing growth performance, and enhancing gut health. We hypnotized that the use of a specific form of ZnO (small aggregates and agglomerated particles; SAAP), which provides a greater antibacterial property than stand...
A total of 300 pigs (initial body weight = 6.0 kg) were used to evaluate the effects of altering diet acid-binding capacity-4 (ABC-4) with specialty soy protein sources or acidifiers on nursery pig performance and fecal dry matter (DM). At weaning, pigs were allotted to 1 of 5 dietary treatments. There were 5 pigs/pen and 12 replications/treatment....
The Improving Pig Survivability Project has completed 5 yr encompassing research, education, and extension with the goal of reducing overall mortality in the U.S. commercial swine industry. The project is funded by National Pork Board and Foundation for Food and Agriculture Research, and continues through 2026. Team members represent institutions i...
Two experiments evaluated the effects of precision feeding lactating sows. In both experiments, sows were blocked by parity and allotted to treatment on d 2 of lactation. The first experiment included a total of 95 mixed parity sows and litters. Treatments included a control, NRC (2012), or INRA (2009) treatment curve. Sows on the NRC or INRA treat...
Two experiments evaluated the effects of increasing standardized ileal digestible (SID) Val:Lys ratio on the growth performance of 38 to 67 kg (Exp. 1) and 90 to 116 kg (Exp. 2) finishing pigs. In Exp. 1, pigs (n = 647; DNA 600 × 241) were randomly allotted to 1 of 6 dietary treatments with 8 or 9 pigs per pen and 12 replications per treatment. Die...
A total of 300 weanling pigs (241 × 600, DNA, initial body weight = 5.6 ± 0.2 kg) were used to evaluate the effects of altering the acid-binding capacity-4 (ABC-4) of nursery diets with different specialty soybean products and organic acids on performance and fecal dry matter (DM). At weaning, pigs were allotted to 1 of 6 dietary treatments. There...
A total of 728 sows and litters were used in a 19-d lactation study to evaluate effects of precision feeding SID Lys and other amino acids on sow and litter performance and feed cost in a commercial farm. Sows were blocked by parity and allotted to 1 of 2 treatments at entry into farrowing. Treatments consisted of a control diet or a feed blending...
A total of 1,570 finishing pigs (337 × 1050, PIC; initially 103.4 ± 0.85 kg) were used in a 28-d trial to determine the effects of feeding increasing standardized ileal digestible (SID) Lys to pigs between 100 to 130 kg on growth performance, carcass characteristics, and economics. Before the beginning of the study, the 3 heaviest pigs per pen were...
Prior to 2013, pathogen transmission through feed was focused primarily on bacteria and biosecurity was used to prevent adulterant entry into the ingredients and the feed mills. Following the porcine epidemic diarrhea virus (PEDV) outbreak in 2013, research focused on pathogen mitigation and control quickly became a subject of interest. Since PEDV,...
A total of 1,512 pigs [initial body weight (BW) = 4.7 kg] were used to evaluate lactose level and whey permeate form on nursery pig performance in a commercial environment. Pigs were weaned at approximately 19 d of age and allotted to 1 of 4 dietary treatments arranged in a 2 × 2 factorial utilizing low or high lactose levels with either granular w...
A total of 87 sows (Line 241, DNA) and their offspring were used to evaluate the effect of increasing standardized ileal digestible (SID) lysine through increasing soybean meal (SBM) concentration in late gestation diets on lactating sow and litter performance. Sows were blocked by parity and body weight (BW) on approximately d 90 of gestation and...
A total of 360 pigs (initial body weight = 5.9 kg) were used to evaluate the effects of increasing acid-binding capacity-4 (ABC-4) of the diet on nursery pig performance and fecal dry matter (DM). At weaning, pigs were allotted to 1 of 6 dietary treatments. There were 5 pigs/pen and 12 replications/treatment. Pigs were fed experimental diets in two...
This study was conducted to evaluate the effects of dietary NE on growth performance, carcass characteristics, and removal and mortality rates of grow-finish pigs. A total of 1,927 pigs [initial body weight (BW) 23.3 ± 0.23 kg] were used in a 125-d study. Pens of pigs were blocked by BW and randomly allotted to dietary treatments in a randomized co...
Our objective was to assess the effects of percentage body weight (BW) change in developing Duroc boars on semen collection training, semen production parameters, and longevity in a commercial boar stud. Retrospectively, 164 boars were divided into one of three groups based on their percentage BW change from arrival to the boar stud until the end o...
A total of 271 mixed parity sows (PIC 1050) were used to evaluate the effect of feeding Flavolac in lactation diets on sow farrowing performance and litter growth performance during summer conditions. Flavolac (Agroceres Multimix; Rio Claro, Sao Paulo, Brazil) is a commercial product containing several compounds, including amino acids, antioxidants...
The intestinal barrier of pigs can be compromised by many factors including health challenges, off-feed events, and environmental stressors. If dysregulated barrier function is caught early, proper treatment can be initiated to potentially prevent more severe complications to overall health. However, there are few procedures to measure intestinal f...
A total of 1,026 grow-finish pigs (337 × 1050, PIC; initially 26.0 ± 0.33 kg) were used in a 124-d trial to compare sulfate and hydrochloride forms of Zn, Mn, and Cu on growth performance, carcass characteristics, and weight variation, of grow-finish pigs. Pigs were housed in mixed gender pens with 27 pigs per pen and 19 pens per treatment. The tre...
A total of 2,265 finishing pigs [337×1050, PIC; initial body weight (BW) = 50.2 kg) were used in two 28-d trials to determine the effect of increasing net energy (NE) or standardized ileal digestible Lys in soybean meal (SBM) based diets on early and late finishing pig performance. There were 27 pigs/pen and 21 pens/treatment. Soybean meal NE value...
A total of 2,200 pigs (Duroc sire (PIC 800 or DNA 600) × PIC Camborough; initial body weight = 24.2 ± 0.30 kg) were used in a 117-d growth trial to evaluate the effects of increasing dietary sodium diformate on finishing pig growth performance and carcass characteristics. Pens of pigs (25 pigs per pen) were randomly assigned to 1 of 4 dietary treat...
A total of 2,160 mixed-gender pigs [PIC 337 × 1050; initial body weight (BW) = 24.9 ± 0.97 kg) were used in the 120-d study to compare feeding strategies (phase feeding vs complete diet blending) at different SID Lys levels (90 vs 100% of suggested requirement estimates) on finishing pig growth performance, carcass characteristics, and economics. P...
Pigs [n = 2.268; L337×1050 PIC; initial body weight (BW) = 5.5 ± 0.17 kg] were used in a 42-d growth study to evaluate the effects of herbal active D (a source of calcitriol) on growth performance, bone characteristics, and serum criteria of nursery pigs. Pigs were weaned at approximately 21-d of age and randomly allotted to 1 of 3 dietary treatmen...
A total of 340 barrows (DNA 200 × 400, initially 6.1 kg) were used in a 38-d growth study to determine the effect of botanical extracts of capsicum oleoresin, clove essential oil, and garlic essential oil (CCG; Fytera Start, Selko, Indianapolis, IN) in diets with or without pharmacological levels of Zn and Cu on growth performance and fecal dry mat...
Mixed parity sows (n = 28; Line 241; DNA) and their offspring were used in a farrow-to-finish study to evaluate the effect of live yeast supplementation during lactation with or without yeast extract supplementation during the nursery period on sow and litter performance and lifetime growth performance, antibody titers, and carcass characteristics....
The goal of this experiment was to identify water characteristics that affect the ability to reduce pH when using water acidifiers. A total of 27 water samples from swine operations across the Midwest were collected and pH, Ca, and Mg were analyzed. Total hardness was calculated as the combined values of Ca and Mg and expressed in mg of CaCO3/L. Ha...
A total of 300 pigs [241×600; DNA, Columbus, NE; initial body weight (BW) = 6.0 ± 0.01 kg] were used in a 42-d trial to determine the effects of vitamin E levels and partially replacing vitamin E with a polyphenol (Cabanin CSD, R2 Argo, Denmark) on growth performance, complete blood count (CBC), serum thiobarbituric acid reactive substances (TBARS)...
Pigs [n = 4,683; 337 × 1050, PIC; initial body weight (BW) = 13.0 ± 0.01 kg] were used in a 21-d trial to investigate the interaction of net energy (NE), standardized ileal digestible lysine (SID Lys), and soybean meal (SBM) content used at five different levels on growth performance of nursey pigs. Pigs were housed in mixed sex pens with 35 pigs p...
Two experiments were conducted in a commercial environment to evaluate anchovy fish meal with or without added anchovy fish solubles on nursery pig performance. In Exp. 1, pigs [n = 2,172; initial body weight (BW) = 5.2 kg] were randomly allotted to 1 of 6 dietary treatments. There were 25 or 27 pigs/pen and 14 replications/treatment. Dietary treat...
Barrows (n = 350; DNA 200×400; [n = 2,172; initial body weight (BW) = 6.0 ± 0.06 kg] were used in a 38-d growth trial to determine the effects of increasing folic acid on nursery pig growth performance and serum homocysteine. Pigs were weaned at 21 d of age and randomly allotted to 1 of 5 dietary treatments in a completely randomized design. A tota...
Due to its importance in animal feed, soybean meal has been extensively studied to optimize its use in livestock diets. Despite extensive research, the industry has not fully characterized specific areas of soybean processing such as the inclusion of soybean byproducts added back to soybean meal during processing. Soybean processing byproducts can...
A total of 720 barrows (Line 200 × 400, DNA Genetics) were used in two 42-d nursery trials (initially 6.20 ± 0.12 kg and 5.63 ± 0.16 kg, respectively) to evaluate strategies for allotting pigs to pens in randomized controlled trials. At placement, the population was split into 3 cohorts with similar average weight and standard deviation and randoml...
Three studies were conducted evaluating the use of benzoic acid in swine diets. In experiment 1, 350 weanling barrows (DNA 200 × 400; initially 5.9 ± 0.04 kg) were allotted to one of the five dietary treatments with 14 pens per treatment. Diets were fed in three phases: phase 1 from weaning to day 10, phase 2 from days 10 to 18, and phase 3 from da...
Pigs from 64 commercial sites across 14 production systems in the Midwest United States were evaluated for baseline biological measurements used to determine bone mineralization. There were three pigs selected from each commercial site representing: 1) a clinically normal pig (healthy), 2) a pig with evidence of clinical lameness (lame), and 3) a p...
Antimicrobial Resistance (AMR) in bacteria is a growing public health concern in the US and around the world threatening the continual use of antimicrobials. In pigs, the oral route, either in-feed or in-water, is by far the most common route of administration of antimicrobials. Because the distribution of the antibiotic in the gut and the dosages...
African swine fever virus (ASFV) is a highly infectious virus known to cause substantial mortality and morbidity in pigs. The transmissibility and severity of disease within pigs, as well as the potentially resultant catastrophic trade ramifications, warrant its status as a foreign animal disease of substantial concern to the United States. The ASF...
This experiment aimed to evaluate commercially available disinfectants and their application methods against porcine epidemic diarrhea virus (PEDV) and porcine reproductive and respiratory syndrome virus (PRRSV) on truck cab surfaces. Plastic, fabric, and rubber surfaces inoculated with PEDV or PRRSV were placed in a full-scale truck cab and then t...
Three experiments evaluated omega-3 fatty acids, provided by O3 trial feed, on nursery pig growth performance, mortality, and response to an LPS immune challenge or natural Porcine reproductive and respiratory virus (PRRSV) outbreak. In experiment 1, 350 pigs (241 × 600, DNA; initially 5.8 kg) were used. Pens of pigs were randomly assigned to one o...
The objective of this experiment was to determine effects of pelleting on the standardized ileal digestibility (SID) of amino acids (AA) and crude protein (CP) in diets with or without increased concentrations of free AA and reducing sugars (RS). Eight individually housed, ileal cannulated barrows (initially 31.4 kg) were allotted to an 8 × 8 Latin...
A total of 280 pigs (DNA 241 × 600, initially 10.4 ± 0.24 kg) were used in a 21-d study to determine the available P (aP) release curve for Sunphase HT phytase (Wuhan Sunhy Biology Co., Ltd., Wuhan, P.R. China) when fed diets with a high phytate concentration. On day 21 post-weaning, considered day 0 of the study, pigs were blocked by average pen b...
Antimicrobial resistance (AMR) in bacteria is a major public health concern in the US and around the world. Campylobacter is an important foodborne pathogen that resides in the gut of pigs and is shed in feces, with the potential to be transmitted to humans. In pigs, the oral route, either in-feed or in-water, is by far the most common route of adm...
Data from Europe indicate that commercial diets for pigs and poultry contain significantly more Ca than formulated. Therefore, a survey of commercial pig diets used in the United States was conducted to test the hypothesis that the analyzed concentrations of total Ca and total P in commercial pig diets in the United States are not greater than form...
Citations
... Calcium is often over-supplied in diets for pigs because limestone (i.e., calcium carbonate) is less expensive than other feed ingredients and therefore is generously supplied in diets (Walk, 2016;Lagos et al., 2023). Limestone is also sometimes used as a carrier in vitamin and mineral premixes and in premixes containing feed additives and limestone may be used as a flow agent in some feed ingredients including soybean meal, distillers dried grains with solubles, and bakery meal resulting in variable concentrations of Ca in these ingredients. ...
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