Life Sciences Commons^™

Effect Of Holstein And Beef-Dairy Cross Breed Description On The Sale Price Of Feeder And Weaned Calf Lots Sold Through Video Auctions, E. D. Mccabe, M. E. King, K. E. Fike, K. G. Odde

Kansas Agricultural Experiment Station Research Reports

Objective:Objectives were to determine: 1) value of Holstein feeder steer lots compared with steer lots of other breed descriptions, 2) value of beef-dairy cross weaned steer calves compared with either Holstein weaned calves or weaned calves of other breed descriptions, and 3) value of beef-dairy cross weaned calves compared with weaned calves of other beef breed descriptions sold through video auctions.

Study Description:Data on 14,075 feeder steer lots sold in 211 auctions from 2010 through 2018; 763 weaned steer calf lots, and 1,125 weaned steer and heifer calf lots sold via seven auctions in 2020 and 2021 were …

Evaluating A Dry Vs. Wet Disinfection In Boot Baths On Detection Of Porcine Epidemic Diarrhea Virus And Porcine Reproductive And Respiratory Syndrome Virus Rna, Olivia L. Harrison, Grace E. Houston, Allison K. Blomme, Haley K. Otott, Jianfa Bai, Elizabeth G. Poulsen Porter, Jason C. Woodworth, Chad B. Paulk, Jordan T. Gebhardt, Cassandra K. Jones

Kansas Agricultural Experiment Station Research Reports

Maintaining biosecurity between swine barns is challenging, and boot baths are an easily implementable option some utilize to limit pathogen spread. However, there are concerns regarding their efficacy, especially when comparing wet or dry disinfectants. The objective of this study was to evaluate the efficacy of boot baths in reducing the quantity of detectable porcine epidemic diarrhea virus (PEDV) and porcine reproductive and respiratory syndrome virus (PRRSV) genetic material using wet or dry disinfectants. Treatments included 1) control; 2) dry chlorine powder (Traffic C.O.P., PSP, LLC, Rainsville, AL); and 3) wet quaternary ammonium/glutaraldehyde liquid (1:256 Synergize, Neogen, Lexington, KY). Prior …

Evaluation Of Grazing Options During Summer For Growing Heifers – Year 2, J. K. Farney

Kansas Agricultural Experiment Station Research Reports

Developing methods to provide high quality forage through most of the year is important for cattle operations. The purpose of this study was to determine forage management options to offset the summer “slump” with fescue. Four grass pasture treatments (10 pastures total; 4 acres each) were used in a completely randomized design and stocked with growing heifers (n = 49; initial wt 473 ± 60 lb). Pasture treatments consisted of novel fescue (FES), crabgrass (CRAB), bermudagrass (BERM), and sorghum-sudan interseeded into novel fescue (SS-FES). Heifers were weighed and grazed pastures from April to September (153 d). Heifers on FES were …

Evaluation Of A Dried Fermentation Product Administered Through Drinking Water On Nursery Pig Growth Performance, Fecal Consistency, And Antibiotic Injections, Alan J. Warner, Alexandra L. Gerrard, Mike D. Tokach, Raghavendra G. Amachawadi, Alain Labbé, Walter Heuser, Ramya Kalam, Xiaorong Shi, T. G. Nagaraja, Joel M. Derouchey, Jason C. Woodworth, Robert D. Goodband, Jordan T. Gebhardt

Kansas Agricultural Experiment Station Research Reports

A total of 350 barrows (DNA 200 × 400; initially 13.5 ± 0.02 lb) were used in a 42-d study to evaluate the effects of a dried fermentation product administered through drinking water on nursery pig growth performance, antibiotic injection frequency, fecal consistency, and fecalEscherichia colipresence. Upon arrival to the nursery research facility, pigs were randomly assigned to pens (5 pigs per pen) and pens were allotted to 1 of 2 water treatments with 35 pens per treatment. Water treatments were provided with or without a fermentation product administered through the water lines at a 1:128 dilution rate …

A Limit-Fed, High-Energy Diet Fed During The Growing Phase Does Not Negatively Affect Subsequent Feedlot Growth Performance Or Carcass Merit Compared To Feeding A Traditional Roughage-Based Diet Ad Libitum During The Growing Phase, M. A. Scilacci, E. C. Titgemeyer, S. P. Montgomery, T. J. Spore, A. J. Tarpoff, T. G. O'Quinn, K. Montgomery, W. R. Hollenbeck, D. A. Blasi

Kansas Agricultural Experiment Station Research Reports

Objective:The objective of this experiment was to compare the subsequent growth performance and carcass impacts of a high-energy diet limit-fed at 2.2% of body weight (BW) or a traditional roughage-based diet fedad libitumduring the growing phase.

Study Description:Three hundred seventy crossbred heifers (initial BW = 496 ± 44 lb) previously used in a 90-day growing study at the Kansas State University Beef Stocker Unit were transported to a commercial feedlot (Pratt Feeders, Pratt, KS) for finishing where cattle were fed a common diet. The two backgrounding diets included: (1) 45 Mcal of net energy for gain …

Effect Of Ruminally-Protected Lysine Supplementation To Growing Cattle On Growth And Subsequent Finishing Performance, K. J. Hazlewood, M. S. Grant, D. A. Blasi, G. A. Ducharme, E. C. Titgemeyer

Kansas Agricultural Experiment Station Research Reports

Objective:The objective of this study was to evaluate the effects of ruminally-protected lysine supplementation fed during the growing phase to cattle limit-fed a corn-based diet, and to evaluate the subsequent finishing performance.

Study Description:For 77 days, a group of 338 steers limit-fed at 2.4% of body weight daily on a dry matter basis were allocated to treatments providing 0, 3, or 6 g/day of lysine from Smartamine ML (Adisseo, Alpharetta, GA), or containing blood meal plus ruminally-protected methionine from Smartamine M. Growth performance was measured over the growing period. Cattle were then shipped to a commercial feedlot and …

Vegetation And Animal Production In Pastures Sprayed For Western Ragweed Control, Keith Harmoney, John Jaeger

Kansas Agricultural Experiment Station Research Reports

Western ragweed (Ambrosia psilostachya) is a common native forb found throughout Kansas native rangelands and in some seeded pastures. Over time, western ragweed can form dense colonies from growth of lateral creeping rootstalks with multiple buds that can initiate new growth and form an upright stem and plant. Past research has shown that western ragweed does not compete with native grass production until ragweed contributes over approximately 35% of the forage dry matter of a pasture area. Cattle have utilized western ragweed in past long-term historical grazing trials. In a previous long-term trial at Hays, KS, western ragweed …

Interseeding Sorghum-Sudangrass Into Perennial Cool-Season Western Wheatgrass Pasture, Keith Harmoney, John Guretzky

Kansas Agricultural Experiment Station Research Reports

Conversion of pastureland into cropland has occurred at a rapid rate on the Great Plains. A reduction in total acreage of pastureland from this conversion has resulted in a decline of total numbers of beef cows in the same region. One method to mitigate the decline in cow numbers is to increase the carrying capacity of the remaining pastureland acres. To achieve this goal, a study was conducted to introduce warm-season annual grass species into perennial cool-season grass pastures to increase dry matter production during the mid-summer time period that perennial cool-season grasses would be most dormant. An increase in …

Effect Of Early Vs. Late Maturing Sire Lines And Creep Feeding On The Stress Response, Intestinal Permeability, And Growth Performance Of Nursery And Finishing Pigs, Madie R. Wensley, Jason C. Woodworth, Mike D. Tokach, Robert D. Goodband, Joel M. Derouchey, Jordan T. Gebhardt

Kansas Agricultural Experiment Station Research Reports

A total of 21 litters (early or late maturing Duroc × DNA 241) and 247 pigs were used in 170-d trial to determine the effect of sire line growth pattern (early vs. late maturing) and creep feeding on the stress response, intestinal permeability, and growth performance of nursery and finishing pigs.Treatments were arranged in a 2 × 2 factorial with main effect of Duroc sire line (early or late maturing) and lactation creep feeding (with or without). Immediately after weaning (initially 14.0 lb), blood cortisol levels were increased (P<0.01) in late maturing pigs compared to early maturing pigs, indicating an increased stress response. A greater percentage (P<0.001) of late maturing pigs lost weight from d 0 to 3 post-weaning compared to early maturing pigs. Likewise, early maturing pigs had improved ADG (P<0.001) and ADFI (P<0.001) during the first 3 d in the nursery. A similar response was observed in daily feed intake with early maturing pigs having increased daily feed intake (P<0.001) for the first 14 d in the nursery. However, no differences were observed in intestinal permeability between treatments. For overall nursery growth performance, a significant interaction was observed for ADG (P= 0.007) and ADFI ( …

Evaluation Of Corn Protein Source On Feed Intake Preference In Nursery Pigs, Ethan B. Stas, Robert D. Goodband, Mike D. Tokach, Jason C. Woodworth, Joel M. Derouchey, Jordan T. Gebhardt

Kansas Agricultural Experiment Station Research Reports

A total of 180 pigs (241 × 600, DNA; initially 17.0 ±1.6 lb) were used to determine feed intake preference from various corn protein sources. A series of 5-day preference trials were used with two diets offered within each comparison with feeder location rotated daily within each pen. Feed consumption was used to determine preference between each diet comparison. There were 6 replicates of each diet comparison. The corn protein sources utilized in this experiment included: fermented corn protein, high protein distillers dried grains with solubles (HPDDGs), whole stillage solids (approximately 2/3 content of fermented corn protein), and thin stillage …

Measurement Of The Acid-Binding Capacity Of Common Ingredients And Complete Diets Intended For Weanling Pigs, Ethan B. Stas, Mike D. Tokach, Joel M. Derouchey, Jason C. Woodworth, Robert D. Goodband, Jordan T. Gebhardt

Kansas Agricultural Experiment Station Research Reports

Some ingredients bind more acid in the stomach than others which can increase gastric pH in weaned pigs, causing decreased protein digestion and allowing pathogenic microorganisms to proliferate. The objective of this experiment was to measure acid-binding capacity at a pH of 4 (ABC-4) of common nursery ingredients and determine additivity in diets. Ingredient categories included: cereal grains, vegetable proteins, animal proteins and milk, vitamin premixes and minerals, amino acids, and fiber sources. A 0.5 g sample of each ingredient was suspended in 50 mL of distilled deionized water and titrated with 0.1 N hydrochloric acid. Sample ABC-4 was calculated …

Effects Of Feeding Increasing Standardized Ileal Digestible Lysine On Growth Performance Of 26- To 300-Lb Pic Line 800-Sired Pigs, Katelyn N. Gaffield, Mike D. Tokach, Jason C. Woodworth, Joel M. Derouchey, Robert D. Goodband, Jordan T. Gebhardt, Carine M. Vier, Matthew Spindler, Uislei Orlando, Luis Zargoza, Ning Lu, Wayne Cast, Danielle F. Wilson-Wells, Julia P. Holen, Alyssa M. Betlach

Kansas Agricultural Experiment Station Research Reports

The objective of this study was to evaluate the growth performance and economic returns of PIC 800 × 1050 pigs fed increasing SID Lys from approximately 26 to 300 lb. Pens of pigs were blocked by BW and randomly assigned to 1 of 5 dietary treatments in a randomized complete block design with 26 pigs per pen and 16 pens per treatment. Pens were provided 1 of 5 dietary treatments with increasing SID Lys at 85, 93, 100, 107, and 115% of current PIC recommendations within 6 different phases. Two base diets containing low Lys and high Lys were blended …

Effect Of Corn Type And Form Of Supplement On Grazing Steers, J. K. Farney, T. Bottorff

Kansas Agricultural Experiment Station Research Reports

Eighty stocker steers were grazed on bromegrass from April to the beginning of November and were provided five different feeds while on grass during the summer. Treatments evaluated included (1) mineral only; (2) free-choice supplementation in the form of liquid feed (MIX30) or (3) block format (Mintrate 40 Red); and hand-fed supplements of 60% corn:40% dried distillers grains at 0.5% of body weight on a dry matter basis offered daily where the corn was either an (4) isoline corn (ISO; parent genetic line) or (5) Enogen feed corn (ENO; includes alpha-amylase gene). Steers were weighed every 28 days while on …

Growth Performance Of Broilers In Response To Increasing Concentration Of Multiple Mycotoxins In Contaminated Corn, Allison K. Blomme, Khairy I. Jenkins, Kara M. Dunmire, Nelsa M. Beckman, Haley K. Otott, Charles R. Stark, Chad B. Paulk

Kansas Agricultural Experiment Station Research Reports

Mycotoxins in grains are a result of mold or fungal growth from environmental stressors and cause detrimental impacts to poultry production. Thus, the objective of this experiment was to determine the effects of increasing concentration of a combina­tion of mycotoxins on growth performance of broiler chicks. A total of 250 one-day-old male broilers (Cobb 500; initial BW 0.092 lb) were used in a 15-d study. Broilers were housed in 3 Petersime batteries withad libitumaccess to feed and water. Treatments were randomly assigned to 1 of 50 cages within location block, resulting in 10 cages per treatment with 5 …

Impact Of Disclosing Fat Content On Consumer Sensory Evaluation Of Ground Beef From A Similar Source, K. R. Lybarger, K. M. Harr, E. S. Beyer, K. J. Farmer, S. G. Davis, M. D. Chao, J. L. Vipham, M. D. Zumbaugh, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective:The objective of this study was to determine the impact of providing consumers with information regarding the fat content of ground beef on the consumer’s eating experience.

Study Description:Ground beef chubs that were 80% lean/20% fat (n= 15/panel type) were obtained, and 0.25-lb patties were fabricated from the chubs. Chubs were assigned randomly to panels. Panelists received samples labeled as the following: 90% lean/10% fat (90/10), 80% lean/20% fat (80/20), 73% lean/27% fat (73/27), lean, extra lean, and one sample with no information given (NONE). Samples were evaluated by consumers (n = 105), who were provided information …

Feed Efficiency Is Better And Activity Is Greater In Growing Cattle Limit-Fed A High-Energy Diet During The Growing Phase Compared To A Traditional Roughage-Based Diet Fed For Ad Libitum Intake, M. A. Scilacci, E. C. Titgemeyer, S. P. Montgomery, T. J. Spore, A. J. Tarpoff, T. G. O'Quinn, W. R. Hollenbeck, D. A. Blasi

Kansas Agricultural Experiment Station Research Reports

The objective of this experiment was to compare performance impacts of a high-energy diet limit-fed at 2.2% of body weight (BW) daily on a dry matter (DM) basis to a traditional roughage-based diet fed forad libitumintake during the growing phase.

Study Description:Three hundred seventy crossbred heifers (initial BW = 496 ± 44 lb) were used in a receiving and growing study at the Kansas State University Beef Stocker Unit in the spring of 2020. Animals were fed once daily at 7:00 a.m. Bunks were visually observed, and feed refused was estimated.Ad libitumfeed refusal was targeted …

Digestibility Of Dry Matter Is Better And Manure Output Is Lower In Growing Cattle Limit-Fed A High-Energy Diet During The Growing Phase Compared To A Traditional Roughage-Based Diet Fed For Ad Libitum Intake, M. A. Scilacci, E. Titgemeyer, S. P. Montgomery, T. J. Spore, A. J. Tarpoff, T. G. O'Quinn, W. R. Hollenbeck, D. A. Blasi

Kansas Agricultural Experiment Station Research Reports

Objective:Evaluate the impact on intake and digestion of a high-energy diet limit-fed at 85% of thead libitumdaily consumption of a roughage-based diet on a dry matter (DM) basis compared to a traditional roughage-based growing diet in growing cattle.

Study Description:Eight ruminally cannulated crossbred Angus heifers (body weight = 450 ± 24 lb) were used in a cross-over design with two consecutive 15-day periods at the Kansas State University Beef Stocker Unit. Two dietary treatments were fed: (1) 45 Mcal of net energy for gain (NE_g) per 100 lb of DM fed forad libitum …

Syngenta Enogen Corn Fed As Corn Grain And Corn Silage In Diets Containing Corn Coproducts Did Not Enhance Growth Performance Of Growing Heifers, M. A. Scilacci, M. A. Johnson, E. C. Titgemeyer, S. P. Montgomery, A. J. Tarpoff, E. D. Watson, W. R. Hollenbeck, Dale Blasi

Kansas Agricultural Experiment Station Research Reports

Objective:Evaluate the effect of feeding corn grain and corn silage from Syngenta Enogen corn hybrids (EC; Syngenta Seeds, LLC., Downers Grove, IL) or conventional corn hybrids in diets containing either wet distillers grain (WDG; ICM Biofuels, St. Joseph, MO) or Sweet Bran (WCGF; Cargill Animal Nutrition, Blair, NE) on growth performance in growing cattle.

Study Description:Three hundred eighty-four crossbred heifers [initial body weight (BW) = 582 ± 42 lb] were used in a completely randomized design, 81-day receiving and growing study, with a 2 × 2 factorial arrangement of four dietary treatments. Experimental diets were formulated to contain …

Syngenta Enogen Corn Fed As Corn Grain And Corn Silage In Diets Containing Corn Coproducts Did Not Enhance Diet Digestibility In Growing Heifers, M. A. Scilacci, M. A. Johnson, E. C. Titgemeyer, S. P. Montgomery, A. J. Tarpoff, E. D. Watson, W. R. Hollenbeck, D. A. Blasi

Kansas Agricultural Experiment Station Research Reports

Objective:Evaluate the effect of feeding corn grain and corn silage from Enogen corn (EC; Syngenta Seeds, LLC., Downers Grove, IL) or conventional corn (CON) in diets containing either wet distillers grain (WDG; ICM Biofuels, St. Joseph, MO) or Sweet Bran [proprietary wet corn gluten feed (WCGF); Cargill Animal Nutrition, Blair, NE] on intake and digestibility in growing cattle.

Study Description:Eight ruminally cannulated crossbred heifers (initial body weight = 816 ± 94 lb) were used in an intake and digestibility study designed as a replicated 4 × 4 Latin square. Four consecutive, 15-day periods consisted of 10 days for …

Field Trial Assessing The Use Of Sex-Sorted Semen In Beef Cattle, K. W. Aubuchon, J. A. Odde, C. Bronkhorst, E. M. Bortoluzzi, M. J. Goering, K. E. Fike, K. G. Odde

Kansas Agricultural Experiment Station Research Reports

Objective:The objective was to evaluate the reproductive performance of sex-sorted semen on beef cows and heifers.

Study Description:For this trial, 320 Angus and SimAngus cows and heifers from four groups were used. Group 1 yearling heifers (n = 101) were synchronized using the melengestrol acetate plus prostaglandin F_2α(MGA-PGF_2α) protocol and Groups 2, 3, and 4 cows (n = 219) were synchronized using the 7-Day CO-Synch + CIDR protocol. Insemination was done with semen from an Angus sire (Group 1 yearling heifers and Group 2 young cows) sorted to contain>90% X-bearing sperm, or a …

Impacts Of A Post-Transport/Pre-Processing Rest Period On The Growth Performance And Serum Metabolites Of Cattle Entering A Feedlot, P. L. Dahmer, Z. T. Buessing, N. B. Stafford, M. E. Reeb, C. A. Zumbaugh, A. J. Tarpoff, K. G. Odde, J. S. Drouillard, M. Theurer, T. Jones, C. K. Jones

Kansas Agricultural Experiment Station Research Reports

Objective:The objective of this study was to evaluate the impact of a post-transport rest period on receiving calf growth performance and blood serum metabolites as indicators of immune function.

Study Description:Eighty heifers were purchased from a sale barn and transported 6 hours to the Kansas State University Beef Cattle Research Center where they were processed at one of four times: immediately upon arrival or after a 6-, 24-, or 48-hour rest period. Cattle were then fed for 35 days with growth performance data collected weekly. Blood samples were also collected and analyzed for serum infectious bovine rhinotracheitis (IBR) …

Changes In The Perception Of Ground Beef Quality As A Result Of Price Per Pound Labeling, E. S. Beyer, K. M. Harr, K. J. Farmer, S. G. Davis, M. D. Chao, J. L. Vipham, M. D. Zumbaugh, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective:The objective of this study was to determine the effect of perceived palatability on ground beef patties by providing consumers with differing price per pound labels.

Study Description:Ground beef chubs (n = 15)of 80% lean/20% fat composition were used for all samples. Patties were formed 11 days after processing into 0.25 lb patties using a commercial patty former.

Samples were cooked to 160°F and served to consumers to determine different quality attributes. Consumers were given the following prices for each sample: Ultra-High - $6.25/lb; High - $5.00/lb; Medium - $3.75/lb; Low - $2.50/lb; Ultra-Low - $1.25/lb or …

Changes In The Perception Of Ground Beef Quality As A Result Of Primal Labeling, L. A. Egger, K. M. Harr, E. S. Beyer, K. J. Farmer, S. G. Davis, M. D. Chao, J. L. Vipham, M. D. Zumbaugh, T. G. O'Quinn

Kansas Agricultural Experiment Station Research Reports

Objective:The objective of this study was to determine the effect of providing primal source information to consumers prior to consumption on palatability ratings of ground beef from the same source.

Study Description:Ground beef chubs that were 80% lean and 20% fat (n = 15) were used for testing. Samples were served to consumers as 0.25 lb patties that were cooked internally to 160°F. Consumers were asked to evaluate and assess different palatability traits and evaluated samples identified as ground chuck, ground round, ground sirloin, and store ground along with a sample that offered no information.

Bottom Line:Based …

Exploring The Potential Effect Of Phospholipase A2 Antibody To Extend Beef Shelf-Life In A Beef Liposome Model System, C. K. Chun, R. Welti, M. Roth, M. P. Richards, M. D. Chao

Kansas Agricultural Experiment Station Research Reports

Objective:The objective of this study was to utilize a beef liposome model system to investigate if phospholipase-A₂antibody (aPLA2) can be used to inhibit phospholipase-A₂(PLA2) activity to potentially improve beef shelf-life.

Study Description:Phospholipids (PL) from 10 U.S. Department of Agriculture choice beef striploin steaks were extracted and split into six treatments: PL (25 mg of PL); aPLA10 (PL + 25 µg of aPLA2); aPLA20 (PL + 50 µg of aPLA2); PLA2 (PL + 10 µg of PLA2); PLA2+aPLA10 (PL + PLA2 + aPLA10); and PLA2+aPLA20 (PL + PLA2 + aPLA20). The model system was under …

Cattlemen's Day 2022, Beef Cattle Research

Kansas Agricultural Experiment Station Research Reports

This report includes research on beef cattle management, reproduction, nutrition, and meat science conducted at Kansas State University.

Effect Of Sow Feeder Type And Drip Cooling On Sow Body Weight, Litter Performance, And Feeder Cleaning Criteria, Zhong-Xing Rao, Kyle Coble, Mike D. Tokach, Jason C. Woodworth, Joel M. Derouchey, Robert D. Goodband, Jordan T. Gebhardt

Kansas Agricultural Experiment Station Research Reports

A total of 600 mixed parity sows (PIC, Line 3) were used to evaluate the effect of different lactation feeders and drip cooling on lactating sow farrowing performance and litter growth performance during summer conditions. For the lactation feeder evaluation, the trial was conducted in 2 sequential groups with 300 sows per group in the same facility in central Arkansas. Five rooms with 60 farrowing stalls per room were used for each group. At approximately d 110 to 112 of gestation, sows were blocked by body condition score (BCS), parity, and offspring genetics (Line 2 or Line 3 sires). Sows …

Pigs Weaned From Sows Fed A Feed Flavor Had Improved Nursery Performance, But Feed Flavor In The Nursery Diets Did Not Impact Performance, Mikayla S. Spinler, Jordan T. Gebhardt, Joel M. Derouchey, Mike D. Tokach, Robert D. Goodband, Jason C. Woodworth

Kansas Agricultural Experiment Station Research Reports

A total of 360 weaned pigs (DNA 241 × 600: initially 12.6 lb) were used to evaluate the effects of previous sow feed flavoring treatment (control vs. flavor) and nursery diets formulated with or without a feed flavor on growth performance in a 38-d trial. Pigs were weaned at approximately 19 d from sows fed diets with or without 0.05% of the feed flavor (Krave AP, Adisseo, Alpharetta, GA). Pigs were placed in pens (5 to 6 pigs per pen) within sow treatment and were randomly assigned to 1 of 2 dietary nursery treatments. There were 14 to 17 replications …

Heat Stress During The Transition Period Is Associated With Impaired Production, Reproduction, And Survival In Dairy Cows, P. R. Menta, V. S. Machado, J. M. Piñeiro, W. W. Thatcher, J. E. P. Santos, A. Vieira-Neto

Kansas Agricultural Experiment Station Research Reports

The objectives of this retrospective cohort study were to determine the association of heat stress exposure during the transition period with production, health, reproduction, and survival during the first 90 days postpartum in dairy cows. A total of 5,722 Holstein cows (2,324 heifers and 3,397 cows) were categorized into environmental condition (EC) groups based on average temperature humidity index (THI) exposure as thermoneutral (TN) or heat stress (HS) during the pre (Pre) and early postpartum (Post) periods into TN-TN, TN-HS, HS-TN, and HS-HS. In heifers, exposure to HS during the Pre, Post, or Pre and Post was associated with a …

Effects Of Dietary Amino Acid Density And Exogenous Protease Inclusion On Growth Performance And Apparent Ileal Amino Acid Digestibility In Turkeys, Courtney N. Truelock, Haley K. Wecker, Christopher J. Delfelder, Caitln E. Evans, Miguel A. Barrios, Charles R. Stark, Robert S. Beyer, Chad B. Paulk

Kansas Agricultural Experiment Station Research Reports

Protein is one of the most expensive nutrients in poultry diets. In an effort to minimize feed costs, protein digestion and utilization by the animal must be carried out as effi­ciently as possible. The objective of this experiment was to evaluate the effects of dietary amino acid density and exogenous protease inclusion on growth performance and amino acid digestibility in turkey poults. Hybrid turkey poults (n = 780) were fed diets formulated to provide low (LAA) or adequate (AAA) amino acid density (approxi­mately 91 and 100% of the NRC4 recommended requirement for digestible Lys, respec­tively) with each diet being fed …

Daily Activity Measures And Milk Yield Immediately Before And After A Fertile Estrus, J. S. Stevenson

Kansas Agricultural Experiment Station Research Reports

The objective was to characterize changes in milk yield and other physical measures during a 7-day periestrual period encompassing estrus (day 0) and insemination. Lactating dairy cows milked thrice daily were fitted with CowManager SensOor ear tags capable of assessing real time eating, rumination, resting, high activity (estrus), ear-surface temperature, and providing heat alerts. Daily milk was unchanged during the periestrual period. Daily ear-surface temperature was greater during days 1 to 3 compared with day 0. Daily rumination and resting times reached nadirs on day 0, with decreases occurring 48 hours before estrus. Both rumination and resting times increased by …