The Professional Animal Scientist最新文献

{"title":"Case Study: Effects of extended-release eprinomectin on cow-calf performance and reproductive success in a fall-calving beef herd","authors":"C.E. Andresen ,&nbsp;D.D. Loy PAS ,&nbsp;T.A. Brick ,&nbsp;P.J. Gunn PAS","doi":"10.15232/pas.2017-01690","DOIUrl":"10.15232/pas.2017-01690","url":null,"abstract":"<div><p><span>Gastrointestinal parasites cost the US beef industry $3 billion annually. Therefore, the objective of this study was to assess performance parameters and reproductive success of fall-calving beef herds treated with extended-release eprinomectin compared with a conventional anthelmintic<span><span> product. In Exp. 1, 119 fall-calving cows were treated with short-duration injectable ivermectin (n = 53; CONV) or injectable extended-release eprinomectin (n = 66; EPR). Cow and calf performance, pregnancy rates, </span>calving interval, and calving distribution were analyzed. Average daily gain and change in BW were greater in EPR cows (</span></span><em>P</em> ≤ 0.01) than CONV. Pregnancy rates tended to be greater for EPR than CONV cows (<em>P</em><span> = 0.15). Calves from EPR dams were younger at weaning but had greater weaning weights than calves from CONV dams (</span><em>P</em><span> &lt; 0.01). In Exp. 2, 74 yearling fall replacement heifers were treated with short-duration injectable ivermectin (n = 33; CONV) or injectable extended-release eprinomectin (n = 44; EPR). Performance, conception to AI, overall pregnancy rates, and calving distribution the subsequent year were analyzed. Heifers treated with EPR had heavier BW (</span><em>P</em> ≤ 0.10), greater weight gain (<em>P</em> ≤ 0.01), and greater ADG (<em>P</em> &lt; 0.01) than CONV heifers. Conception to AI (<em>P</em> = 0.03) and overall pregnancy rates (<em>P</em> = 0.02) were greater for EPR heifers than CONV. Also, a greater proportion of EPR heifers calved in the first 21 d of the subsequent calving season (<em>P</em> = 0.04) than CONV. Results indicate improved performance and reproductive success for fall-calving beef herds treated with extended-release eprinomectin compared with short-duration ivermectin.</p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 2","pages":"Pages 223-229"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01690","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79886942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Case Study: Documenting grass growth and productivity in a grass-based organic dairy in Oregon","authors":"T. Downing","doi":"10.15232/pas.2017-01659","DOIUrl":"10.15232/pas.2017-01659","url":null,"abstract":"<div><p>Managing pastures on grazing dairies is a continuous challenge because pasture quality, quantity, and growth rate are changing daily. The objectives of this study were to document weekly pasture growth, forage quality, and performance to understand how to use this information to make management decisions on US dairies. One organic grazing dairy was studied for 3 consecutive years. Pastures were measured and mapped, and total standing DM was estimated weekly in all 22 pastures using a calibrated rising plate meter. Weekly grazing wedges were developed and were used to make grazing decisions that week. Paddocks grazed and residual pasture covers were recorded daily. Paddock grazing and residual heights were also included in the electronic recordkeeping. Dry matter yields ranged from 11,277 to 22,346 kg/ha per year and averaged 15,887 ± 1,919, 17,848 ± 1,966 and 17,956 ± 2,014 for each consecutive year. Daily growth rates ranged from 18 to 100 kg/ha per day throughout the season and averaged as high as 56 ± 20.3 kg/ha per day in yr 3. Pasture quality and productivity in Oregon is comparable to some of the most productive dairy pasture systems reported from around the world.</p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 2","pages":"Pages 144-147"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01659","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85549230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Case Study: Water budget of a dairy farm with a tie-stall barn for milk cows and summer pasturing of heifers and dry cows","authors":"A.C. VanderZaag ,&nbsp;S. Burtt ,&nbsp;X. Vergé ,&nbsp;S. Piquette ,&nbsp;T. Wright ,&nbsp;R. Kroebel ,&nbsp;R. Gordon","doi":"10.15232/pas.2017-01654","DOIUrl":"10.15232/pas.2017-01654","url":null,"abstract":"<div><p>Water use (i.e., pumped water) was measured over a full year on a small dairy farm consisting of ~34 lactating and ~39 nonlactating animals (calves, heifers, and dry cows). Crop production was rain fed and was not included in the analysis. Animals were housed in a tie-stall<span> barn during the winter and cool season (mid-October to mid-May) and outdoors in a yard or pasture during the warm season. Annual average water use was 5,180 L/d, with 82% being drinking water and 18% for milking system cleaning. Distinct diurnal patterns of drinking water intake were observed for each animal group, which differed when cows were located indoors or outdoors. Seasonal changes in water intake were significant. Nonlactating animals accounted for 27% of whole-farm water intake in the summer (July–September). In the warm season, herd-scale milk production declined while water consumption increased. As a result, the whole-farm water used per liter of milk had a strong positive correlation with monthly average temperature humidity index (THI) and could have been additionally influenced by other factors such as herd composition, precipitation, feed intake, forage quality and availability, and day length. When THI was below 50, water use ranged from 4.3 to 4.8 L/kg of milk, and it increased to a maximum of 6.7 L/kg at a THI of 68. The annual average water use was 5.35 L/kg of milk. This study demonstrates that the water used per kilogram of milk produced was affected not only by changes in water use but also by changes in herd-scale milk production.</span></p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 1","pages":"Pages 108-117"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01654","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85442216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of floor cooling on lactating sows under mild and moderate heat stress1","authors":"J. Maskal ,&nbsp;F.A. Cabezón ,&nbsp;A.P. Schinckel PAS ,&nbsp;J.N. Marchant-Forde ,&nbsp;J.S. Johnson ,&nbsp;R.M. Stwalley","doi":"10.15232/pas.2017-01661","DOIUrl":"10.15232/pas.2017-01661","url":null,"abstract":"<div><p>The effectiveness of sow cooling pads during lactation was evaluated under mild and moderate heat stress conditions. The moderate heat stress room was targeted to achieve 32°C from 0800 to 1600 h and 27°C for the rest of the day. The mild heat stress room was targeted to achieve 27 and 22°C for the same periods, respectively. Sows received a constant cool water flow of 0.00 (CON, n = 9), 0.25 (LWF, n = 12), or 0.50 (HWF, n = 10) L/min. Respiration rates, rectal temperatures, and skin temperatures were recorded every day (0700 and 1500 h) from the second day in the farrowing room to weaning. The respiration rates of CON sows were 23, 56, 41, and 89 breaths/min, of LWF sows were 21, 24, 29, and 41 breaths/min, and of HWF sows were 18, 20, 24, and 27 breaths/min, and respiration rate increased (<em>P</em> &lt; 0.001) as heat stress increased from mild at 0700 h (22°C), to moderate at 0700 h (27°C), to mild at 1500 h (27°C), and to moderate at 1500 h (32°C). The skin temperatures of LWF sows were 1.1, 0.6, 0.8, and 0.4°C less and of HWF sows were 1.7, 0.7, 1.1, and 1.0°C less (<em>P</em> &lt; 0.01) than CON sows for the same heat stress conditions. The rectal temperatures of LWF sows were 0.02, 0.20, 0.11, and 0.58°C less and of HWF sows were 0.04, 0.22, 0.02, and 0.57°C less (<em>P</em> &lt; 0.05) for the same 4 treatments. The sow cooling pads reduced the effect of heat stress.</p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 1","pages":"Pages 84-94"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01661","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81297320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of oral tilmicosin on health and performance in newly received beef heifers","authors":"J.D. Rivera ,&nbsp;J.T. Johnson ,&nbsp;G.K. Blue","doi":"10.15232/pas.2017-01639","DOIUrl":"10.15232/pas.2017-01639","url":null,"abstract":"<div><p><span>The objective of these studies was to determine the effects of feeding tilmicosin on health and performance of newly received beef cattle. Beef heifers (n = 480) were used in 2 studies to determine effects of oral tilmicosin on health and performance. In Exp. 1, 320 heifers (BW = 196 ± 3.3 kg) were administered antimicrobial metaphylaxis before shipment. At arrival they were monitored for signs of bovine respiratory disease. When 10% of the population was morbid, heifers were assigned to either a control receiving diet (CON) or a diet providing 12.5 mg of tilmicosin/kg of BW (TIL). Treatments were fed for 14 d, and morbid animals were treated with injectable antibiotics. Cattle were weighed individually on d 0, 28, and 56. Data were analyzed as a randomized complete block, and morbidity was analyzed as nonparametric data. Feeding TIL resulted in reduced BW at d 28 (</span><em>P</em> = 0.03). Moreover, TIL decreases DMI during the first 14 d (<em>P</em> = 0.0001) and decreased ADG (<em>P</em> = 0.03) and G:F (<em>P</em> = 0.05) from d 0 to 28. There were no differences in morbidity (<em>P</em> = 0.20), and TIL increased total antibiotic cost (<em>P</em> = 0.004). In Exp. 2, 160 beef heifers (BW = 227 ± 2.3 kg) received no metaphylaxis and were processed at arrival. Feeding TIL did not affect morbidity (<em>P</em> = 0.44); however, TIL decreased the number of animals re-treated (<em>P</em> = 0.03) and increased total antibiotic cost (<em>P</em> = 0.04).</p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 1","pages":"Pages 42-50"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01639","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86464988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controlling herbage allowance and selection of cow genotype improve cow-calf productivity in Campos grasslands","authors":"Martín Do Carmo ,&nbsp;Lynn E. Sollenberger ,&nbsp;Mariana Carriquiry ,&nbsp;Pablo Soca","doi":"10.15232/pas.2016-01600","DOIUrl":"10.15232/pas.2016-01600","url":null,"abstract":"<div><p>An experiment was conducted to determine the effect of herbage allowance and cow genotype on herbage and animal responses. High (Hi) and Low (Lo) herbage allowance (4.9 and 2.9<!--> <!-->±<!--> <span>0.14 kg of DM/kg of cattle BW, respectively) and pure (Pu, Hereford and Angus) and crossbred (Cr, F1 crosses) cow genotypes were compared in terms of herbage traits, stocking rate, cow BCS, energy intake, and calf BW at weaning during 2 cow-calf cycles (−240 to +120 d postpartum). Herbage height (5.5 vs. 3.5</span> <!-->±<!--> <!-->0.18 cm, mean ± SE) and herbage accumulation (15.0 vs. 12.5<!--> <!-->±<!--> <!-->1.1 kg of DM/ha per d) were greater (<em>P</em> &gt; 0.01) for Hi than Lo, whereas stocking rate did not differ (<em>P</em> &gt; 0.2) between Hi and Lo (382 vs. 398 ± 7 kg of BW/ha, respectively). Cow BCS was greater (<em>P</em> &gt; 0.05) in Hi than Lo (4.3 vs. 3.9 ± 0.02) and in Cr than Pu cows (4.2 vs. 4.0 ± 0.04). Calf BW at weaning was greater (20 and 10 kg) for Hi than Lo and for Cr than Pu cows, but energy intake (473 vs. 455 ± 4.6 kJ/kg of BW^0.75 per d) was greater (<em>P</em> &gt; 0.05), only in Hi compared with Lo cows. Modeling BCS evolution during the cow-calf cycle confirmed that Hi herbage allowance and Cr cows improved energy balance and cow-calf biological efficiency. This information can be used to improve profitability and mitigate weather variability effects on Campos grassland livestock systems.</p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 1","pages":"Pages 32-41"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2016-01600","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83440689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Case Study: Control of respiratory disease in male Holstein calves with tildipirosin and effect on health and growth from 0 to 4 months of age","authors":"T.M. Hill,&nbsp;J.D. Quigley,&nbsp;F.X. Suarez-Mena PAS,&nbsp;T.S. Dennis,&nbsp;R.L. Schlotterbeck","doi":"10.15232/pas.2017-01694","DOIUrl":"10.15232/pas.2017-01694","url":null,"abstract":"<div><p>In trial 1, phase 1, 48 male Holstein calves initially 2 to 4 d of age were transported 3.5 h to the research facility. Calves were randomly selected to either receive a s.c. injection of Zuprevo (Merck Animal Health, Summit, NJ; 4 mg of tildipirosin/kg of BW; TIL) the day after arrival (d 0) and again at weaning (d 42) or receive no injections (CON). Calves were fed 0.66 kg of milk replacer DM daily for 39 d and then 0.33 kg daily for 3 d. A starter was fed free choice for the 56 d of phase 1. In trial 1, phase 2, the same calves from phase 1 grouped by CON and TIL were moved to group pens (4 pens per treatment, 4 calves per pen) for the next 56 d. The starter was blended with 5% chopped grass hay and fed free choice. Trial 2 was similar to trial 1, phase 2 and used 48 two-month-old male Holstein calves. Calves were randomly selected to receive either a s.c. injection of Zuprevo (4 mg of tildipirosin/kg of BW; TIL) on d 0 or no injections (CON). In trial 1, phase 1, preweaning ADG and BCS change; postweaning starter intake and hip width change; overall starter intake, ADG, and hip width change; final hip width; and final BCS were greater for TIL than CON. During phase 2 of trial 1 and trial 2, calf ADG and hip width change were greater for TIL than CON. Overall, in transported Holstein calves, TIL improved ADG and structural growth by approximately 13%.</p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 1","pages":"Pages 118-123"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01694","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37833790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of fodder production systems for organic dairy farms","authors":"K.J. Soder PAS ,&nbsp;B.J. Heins ,&nbsp;H. Chester-Jones PAS ,&nbsp;A.N. Hafla PAS ,&nbsp;M.D. Rubano","doi":"10.15232/pas.2017-01676","DOIUrl":"10.15232/pas.2017-01676","url":null,"abstract":"<div><p>This study evaluated the feasibility and challenges of implementing sprouted fodder on organic dairy farms. In study 1, 5 grains (barley, oats, wheat, rye, and triticale) were sprouted for 7 d and analyzed for yield and nutritional content. In study 2, lactating cows were fed a TMR during winter and supplemented with either no fodder or 1.4 kg (DM) of sprouted barley fodder. In study 3, 3 organic dairies that fed sprouted barley fodder were monitored monthly for 12 mo to collect data on feed nutritional analysis, milk production and composition, and management. Data from studies 1 and 2 were analyzed as separate replicated complete block designs, and study 3 was a case study. Barley and oats had the greatest (<em>P</em> &lt; 0.05) fresh weight in study 1, oats had the greatest (<em>P</em> &lt; 0.05) DM yield, and barley had the least (<em>P</em> &lt; 0.05) mold score. In study 2, milk production, milk fat, BW, and BCS were not affected by supplemental fodder. Cows fed fodder had lesser (<em>P</em> &lt; 0.05) milk protein production but greater (<em>P</em><span> &lt; 0.05) milk urea N. Income over feed costs favored not feeding fodder except when cracked corn prices increased by 50% over those used in the study. In study 3, labor, cost of production, lack of milk response, barley supply, and mold issues resulted in 2 of the farms discontinuing fodder. Fodder increased milk production slightly on the third farm, probably due to decreased forage quality. Fodder may provide some benefits on small-scale operations, farms with high land values where tillable acreage can produce high-value crops, or for producers experiencing severe, extended drought. Additionally, farms that have an excess of labor may benefit with a sprouted fodder system. However, in many situations, growing high-quality forage would be more economical.</span></p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 1","pages":"Pages 75-83"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01676","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86272922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of injectable trace minerals on the immune response to Mannheimia haemolytica and Pasteurella multocida following vaccination of dairy calves with a commercial attenuated-live bacterin vaccine","authors":"J.H.J. Bittar ,&nbsp;D.J. Hurley ,&nbsp;A.R. Woolums ,&nbsp;N.A. Norton ,&nbsp;C.E. Barber ,&nbsp;F. Moliere ,&nbsp;L.J. Havenga ,&nbsp;R.A. Palomares","doi":"10.15232/pas.2017-01695","DOIUrl":"10.15232/pas.2017-01695","url":null,"abstract":"<div><p><span>The objective was to evaluate the effects of an injectable trace mineral (ITM) supplement containing Zn, Mn, Se, and Cu on the humoral and cell mediated immune responses to vaccine antigens in dairy calves receiving an attenuated-live bacterin vaccine containing </span><span><em>Mannheimia haemolytica</em></span> and <span><em>Pasteurella multocida</em></span>. Thirty 3-mo-old dairy calves received 2 doses (21 d apart) of an attenuated-live <em>M. haemolytica</em> and <em>P. multocida</em> bacterin vaccine (Once PMH, Merck Animal Health, Summit, NJ), and a 5-way modified-live-virus vaccine (Express 5, Boehringer Ingelheim, Vetmedica, St. Joseph, MO). On the day of primary vaccination, animals were randomly assigned to 1 of the 2 treatment groups (n = 15 per group): ITM (ITM administration) or control (sterile saline injection). Treatments were administered concurrently with vaccinations. Blood samples were collected for determination of antibody titers against <em>M. haemolytica</em> and <em>P. multocida</em><span><span> and of antigen-induced proliferation and interferon-γ secretion by </span>peripheral blood mononuclear cells. Serum Se and Mn concentrations were greater (</span><em>P</em> &lt; 0.05) in the ITM group than the control group after ITM use. Serum end-point antibody titers against both bacteria and interferon-γ secretion by peripheral blood mononuclear cells were not different (<em>P</em> &gt; 0.05) between groups. The use of ITM with bovine respiratory disease vaccines enhanced (<em>P</em> &lt; 0.01) antibody titer fold-change to <em>M. haemolytica</em>. Proliferation of peripheral blood mononuclear cells after <em>P. multocida</em> stimulation was increased (<em>P</em> = 0.03) in the ITM group on d 21 relative to baseline value. In conclusion, ITM administration concurrently with bacterin vaccination improved the immune response to <em>M. haemolytica</em> and <em>P. multocida</em> and might be a valuable tool to enhance dairy calves’ response to bovine respiratory disease vaccination.</p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 1","pages":"Pages 59-66"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01695","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76102033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oral administration of Megasphaera elsdenii to Jersey cows during early lactation","authors":"D. Ye ,&nbsp;M.L. Eastridge","doi":"10.15232/pas.2017-01668","DOIUrl":"10.15232/pas.2017-01668","url":null,"abstract":"<div><p>The objective of this study was to determine whether <span><em>Megasphaera elsdenii</em></span> orally administered to transition Jersey cows would improve milk yield and reduce the risk for metabolic disease. Thirty primi- and multiparous Jersey cows, blocked according to parity and date of calving, were used in a randomized complete block design until 90 DIM and fed diets with 51% forage and 17.9 to 28.5% starch. Within each block, cows were assigned to 1 of 2 treatments: (1) control (no dose) or (2) 200 mL of Lactipro by oral drenching at 1 to 2 d postpartum (<em>M. elsdenii</em>, 1 × 10⁸<span><span> cfu/mL; MSBiotec, Littleton, CO). Cows were housed in tie stalls<span> for 4 wk after calving, in which DMI was measured, and then cows were housed in free stalls for 9 wk. </span></span>Dry matter intake, BCS, and BW change were similar between treatments, and no treatment by time interactions occurred. There was no difference in milk yield between the treatments. For cows with ≥3 lactations, those dosed with </span><em>M. elsdenii</em><span> had greater milk and fat yields than the control cows. No treatment effect or treatment by time interactions were detected for milk fat and protein percentages and feed efficiency. Serum and urine ketones were similar between treatments. Although pre- and postpartum diets fed and management strategies for transition cows may affect whether cows respond to oral administration of </span><em>M. elsdenii</em>, mature, higher producing cows with ≥3 lactations may respond with increased milk yield when dosed with <em>M. elsdenii</em>.</p></div>","PeriodicalId":22841,"journal":{"name":"The Professional Animal Scientist","volume":"34 1","pages":"Pages 67-74"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15232/pas.2017-01668","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79200585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}