scholarly journals PSIX-5 Fetal programming in an industry applied setting – Effects of feeding methionine during late gestation on progeny performance, feed efficiency, and carcass quality for feedlot steers

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 411-412
Author(s):  
Kortney Acton ◽  
Ira B Mandell ◽  
Lee-Anne Huber ◽  
Michael A Steele ◽  
Katharine M Wood
Keyword(s):  
Soybean Meal ◽  
Average Daily Gain ◽  
Random Effect ◽  
Late Gestation ◽  
Carcass Quality ◽  
Offspring Performance ◽  
Organ Weights ◽  
Feedlot Steers ◽  
Body Weights ◽  
Methionine Supplementation

Abstract The objective of this study was to assess if rumen-protected methionine supplementation during gestation would impact male offspring performance and carcass quality in an applied setting. Sixty-seven gestating cows were randomly assigned to control (CON), or methionine (MET) treatments. Cows had ad libitum access to hay from a round bale feeder and were fed once daily in a bunk for approximately eight weeks prior to calving either: 0.75 kg/head/d of supplement pellet supplying 12 g rumen-protected MET/cow/d, or identical pellet with no added MET. The 34 steer progeny (MET n = 18; CON n = 16) were transported to a feedlot, assigned to one of seven pens by weight and fed a corn-based grower diet (58% corn silage, 26% alfalfa haylage, 15% soybean meal) for 47 days, followed by a finisher diet (78% high moisture corn, 12% alfalfa haylage, 8% soybean meal) for 115±31.5 days until slaughter. Body weights were recorded biweekly. Organ weights were recorded at slaughter. Carcass quality, meat quality, and rib composition were recorded 24 to 48 hours after slaughter. Data were analyzed using PROC GLIMMIX in SAS, with treatment as the fixed effect, and pen as the random effect. Supplementation of MET during pregnancy increased weaning weight (MET: 311, CON: 291 ±14.8 kg; P ≤ 0.001), final weight (ME: 668, CON: 631 ±16.8 kg; P = 0.01), and individual dry matter intake (MET: 13, CON: 12 ±0.5 kg/d; P = 0.04) during the finishing phase. There was no effect of maternal methionine supplementation (P ≥ 0.05) for average daily gain. Hot carcass weight was greater for MET steers (MET 372 vs. CON 353 ±9.5 kg; P = 0.03), while organ weights and carcass quality were not affected (P ≥ 0.05) by MET supplementation. This study showed that supplementing methionine during late gestation in an industry applied setting improved some offspring performance measures but did not result in enhanced carcass quality.

scholarly journals PSIX-4 Fetal programming – Maternal plane of nutrition effects on progeny performance, feed efficiency, and carcass quality for feedlot steers

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 411-411
Author(s):  
Kortney Acton ◽  
Ira B Mandell ◽  
Lee-Anne Huber ◽  
Michael A Steele ◽  
Katharine M Wood
Keyword(s):  
Soybean Meal ◽  
Average Daily Gain ◽  
Random Effect ◽  
Late Gestation ◽  
Carcass Quality ◽  
Ultrasound Images ◽  
Feed Conversion ◽  
Organ Weights ◽  
Isocaloric Diets ◽  
Progeny Performance

Abstract To evaluate if maternal supplementation of protein and rumen-protected methionine during late gestation affects steer progeny performance and carcass quality, 138 Angus X cows were used in a 3 x 2 factorial arrangement of treatments. Cows were randomly assigned one of three protein treatments (feeding to meet 90%, 100%, or 110% of metabolizable protein (MP) requirements), with(without) 9 g/d of rumen-protected methionine (MET) and fed these isocaloric diets for ~8 weeks before parturition. Steer progeny (n = 56) were assigned to one of seven pens by weight and received a common corn-based grower diet (58% corn silage, 26% alfalfa haylage, 15% soybean meal) for 47 days, followed by a finisher diet (78% high moisture corn, 12% alfalfa haylage, 8% soybean meal) for 115±31.5 days until slaughter. Body weights were recorded biweekly. Monthly ultrasound images of back and rump fats were captured. Organ weights were recorded at the time of slaughter, with carcass and meat quality recorded 24 to 48 hours later. Data were analyzed using PROC GLIMMIX in SAS, with maternal treatment as the fixed effect, and pen as the random effect. Feeding to meet 90% MP requirements resulted in heavier calf weaning weights compared to 100% and 110% (262, 251, and 245 ±13.9 kg, respectively; P = 0.01). Maternal nutritional treatment did not affect average daily gain, dry matter intake, feed conversion during finishing or organ weights. Increasing dietary MP content from 90%, 100% to 110% reduced grade fat thickness (15.5, 14.7, and 11.8 ±1.11 mm, respectively; P = 0.04) and yield grades (2.7, 2.9, and 2.3 ±0.17, respectively; P = 0.04), but increased lean meat yield (49.5, 49.4, and 50.6 ±0.3%, respectively; P = 0.04). These data suggest that maternal MP content may alter steer progeny carcass traits while maintaining animal performance during the finishing period.

scholarly journals 138 Effects of Increasing Soybean Meal in Corn-based Diets on Growth Performance of Late-finishing Pigs

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 70-71
Author(s):  
Julia P Holen ◽  
Robert D Goodband ◽  
Mike D Tokach ◽  
Jason C Woodworth ◽  
Joel M DeRouchey
Keyword(s):  
Amino Acids ◽  
Growth Performance ◽  
Soybean Meal ◽  
Fixed Effects ◽  
Average Length ◽  
Average Daily Gain ◽  
Random Effect ◽  
Finishing Pigs ◽  
Distillers Grains With Solubles ◽  
Dietary Treatments

Abstract Two experiments were conducted to determine the effects of increasing levels of soybean meal (SBM) replacing feed grade amino acids in corn or corn-dried distillers grains with solubles (DDGS)-based diets on growth performance of late finishing pigs. In both experiments, there were 22 to 27 pigs per pen and 14 pens per treatment. Average length of the experiments was 35 (Exp. 1) and 29 days (Exp. 2). Diets were balanced to contain 0.70% SID Lys and 2,667 or 2,610 kcal NE/kg for Exp. 1 and 2, respectively. Minimum amino acid ratios relative to Lys were: Ile, 55; Met&Cys, 60; Thr, 65; Trp, 19.5, and Val, 70. Dietary crude protein ranged from 10.1 to 15.2 for Exp. 1 and 13.6 to 19.4 for Exp. 2. The statistical model considered fixed effects of treatment, linear and quadratic contrasts, and random effect of block. In Exp.1, 1,793 pigs (L337×1050, PIC; initially 104.9 ± 1.4 kg) were fed corn-based diets and pens of pigs were assigned to 1 of 5 dietary treatments with increasing SBM from 5 to 20%. Overall, average daily gain (ADG) and gain-to-feed (G:F) increased (linear; P < 0.05) as SBM increased with the greatest improvement observed as SBM increased from 5 to 8.75%, with little improvement thereafter. In Exp. 2, 1,827 pigs (L337×1050, PIC; initially 97.9 ± 1.1 kg) were used in a similar study as Exp. 1, but all diets contained 25% DDGS and SBM levels increased from 0 to 16%. Overall, G:F and final bodyweight of pigs marginally improved (linear and quadratic, respectively; P < 0.10) as SBM increased, with the greatest performance observed when diets contained 8% SBM. These results suggest that increasing SBM up to 8% at the expense of feed grade amino acids in corn or corn-DDGS-based diets improved ADG or G:F in late-finishing pigs.

scholarly journals Effects of soybean meal level on growth performance of 11- to 25-kg nursery pigs12

2020 ◽  
Vol 4 (2) ◽  
pp. 694-707
Author(s):  
Henrique S Cemin ◽  
Mike D Tokach ◽  
Steve S Dritz ◽  
Jason C Woodworth ◽  
Joel M DeRouchey ◽  
...  
Keyword(s):  
Growth Performance ◽  
Soybean Meal ◽  
Block Design ◽  
Average Daily Gain ◽  
Random Effect ◽  
Experimental Period ◽  
Feed Ratio ◽  
Caloric Efficiency ◽  
Quadratic Effects ◽  
Main Effects

Abstract Four experiments were conducted to determine the effects of increasing soybean meal (SBM) level in diets with or without 25% distillers dried grains with solubles (DDGS) on growth performance of nursery pigs raised in university or commercial facilities. Treatments were arranged in a 2 × 3 factorial with main effects of SBM (27.5%, 32.5%, or 37.5% of the diet) and DDGS (0% or 25% of the diet). A total of 296, 2,502, 4,118, and 711 pigs with initial body weight (BW) of 10.6, 11.7, 12.5, and 12.3 kg were used in Exp. 1, 2, 3, and 4, respectively. There were 10, 16, 13, and 12 replicates per treatment in Exp. 1, 2, 3, and 4, respectively. After weaning, pigs were fed common diets for approximately 21 d. Then, pens of pigs were assigned to treatments in a randomized complete block design with BW as the blocking factor and experimental diets were fed for 21 d. Pigs were weighed and feed disappearance measured to calculate average daily gain (ADG), average daily feed intake (ADFI), gain-to-feed ratio (G:F), and caloric efficiency (CE). Data were analyzed using the GLIMMIX procedure of SAS with block as a random effect and treatment as a fixed effect. Single degree-of-freedom contrasts were constructed to test the linear and quadratic effects of increasing SBM and their interactions with DDGS. Pigs used in all experiments did not undergo major health challenges during the experimental period and due to the low number of mortality and cull events, statistical analysis was not performed on these variables. The average cull rate was 0.7%, 0.5%, 0.2%, and 0%, and the mortality rate was 0.7%, 0.3%, 0.4%, and 0% in Exp. 1–4, respectively. There were interactions (P ≤ 0.039) between SBM and DDGS for G:F and CE in Exp. 2 and for ADG and ADFI in Exp. 3. These were mostly driven by increasing SBM negatively affecting performance in a greater magnitude when diets contained DDGS compared to diets without DDGS. The main effects of DDGS and SBM were more consistently observed across experiments. Pigs fed diets with 25% DDGS had decreased (P ≤ 0.001) ADG and ADFI in all experiments, as well as poorer (P ≤ 0.028) G:F and CE except for Exp. 3. Feeding increasing amounts of SBM generally did not result in any major impact in ADG but consistently improved (linear, P ≤ 0.078) G:F and CE across experiments.

scholarly journals EFFECTS OF CASTRATION ON GROWTH RATE, BODY AND VISCERAL ORGAN WEIGHTS OF PIGS.

2021 ◽  
Vol 13 ◽  
pp. 121-125
Author(s):  
C. Okere ◽  
M. U. Iloje
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Average Daily Gain ◽  
Daily Weight Gain ◽  
Visceral Organ ◽  
Average Daily Weight Gain ◽  
Large White ◽  
Organ Weights ◽  
Visceral Organs ◽  
Body Weights

Effects of castration on growth rate, body and visceral organ weights of pigs were investi­gated using data from intact males, intact females of Large White pigs full or half cast­rated at 2, 4, or 6 weeks of age. Body weights and feed intake were recorded to the nearest 0.1kg at weekly intervals from birth, while weights of abdominal and thoracic organs were taken at slaughter. Results show that age at castration signi­ficantly affected weaning weights and weights at 2 months of age (P < 0.05), but did not affect the weights of visceral organs and the average daily weight gain (P> 0.05). Castration significantly affected weaning weights (P <0.05) average daily gain (P <0.01), body weights at 4 months (P <0.05), but not the weights of the visceral organs (P> 0.05) Intact females and, intact males significant­ly differed in body weights at 4 months and in average daily weight gain (P 0.05). Com­parisons between full castrates and intact males showed significant differences in all the measured parameters except the weights of visceral organs. Full castrates and intact females did not differ, significantly (P > 0.05) in any of the traits measured.

scholarly journals Effects of supplementing processed straw during late gestation on sow physiology, lactation feed intake, and offspring body weight and carcass quality1

2019 ◽  
Vol 97 (9) ◽  
pp. 3958-3971
Author(s):  
Atta Kofi Agyekum ◽  
Daniel A Columbus ◽  
Chantal Farmer ◽  
A Denise Beaulieu
Keyword(s):  
Wheat Straw ◽  
Feed Intake ◽  
Energy Content ◽  
Postprandial Glucose ◽  
Nutrient Digestibility ◽  
Late Gestation ◽  
Carcass Quality ◽  
Offspring Performance ◽  
Feeding Motivation ◽  
Oat Straw

Abstract This study investigated the effects of supplementing late gestation sow diets with processed or unprocessed oat or wheat straw on physiology, early lactation feed intake, and offspring performance. One hundred fifty gestating sows were randomly assigned to 1 of 5 dietary treatments (30 sows per diet) from day 86 of gestation until farrowing. Treatments, arranged as a 2 × 2 factorial plus a control, were a standard gestation diet (control) or control supplemented with 10% wheat or oat straw, processed or unprocessed. Sows were fed a standard lactation diet postfarrowing. The processed straws were produced by high-pressure compaction at 80 °C. On day 101 of gestation (day 15 of the trial), blood samples were collected from a subset of sows (n = 8 per treatment) through ear vein catheters and analyzed for insulin, insulin-like growth factor 1 (IGF-1), prolactin, glucose, and urea concentrations. Fecal samples were collected on days 103 to 104 of gestation to determine nutrient digestibility, and feeding motivation was investigated on day 104. Litter characteristics and sow feed intake were recorded for 7 d postfarrowing. Three piglets per litter were selected at weaning, fed standard diets, and followed to market. Treatment had no effect on feeding motivation, piglet characteristics at birth, estimated milk production, and offspring BW at market or carcass quality. Processed straw improved DM digestibility and energy content and the effect was greater with oat straw (straw × processing effect, P < 0.05). Pre- and postprandial glucose concentrations tended to decrease (P < 0.10) with processing of wheat, but not oat straw, and this effect was more apparent in the preprandial samples. Preprandial prolactin concentration increased with oat but decreased with wheat straw, whereas postprandial IGF-1 and prolactin concentration increased with processing of wheat, but not oat straw (straw × processing, P < 0.05). Sow lactation feed intake improved (P < 0.05) with oat straw supplementation relative to wheat straw. Piglet weaning weight increased (P < 0.05) with oat straw supplementation and processing improved (P < 0.05) nursery exit BW. However, straw supplementation, regardless of processing, had no effect on offspring BW at market or carcass quality. Overall, oat straw supplementation had a greater impact on sow physiology and provided benefits for sows in late gestation, and there was some indication that further benefits could be obtained through mild processing.

PSVI-10 Impact of Soybean Inclusion Level in Late Gestation on Offspring Performance

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 222-222
Author(s):  
Abigail R Loucks ◽  
Dana M van Sambeek ◽  
Elizabeth A Hines
Keyword(s):  
Growth Performance ◽  
Cost Effective ◽  
Late Gestation ◽  
Immunoglobulin Production ◽  
Offspring Performance ◽  
Body Weights ◽  
Inclusion Rate ◽  
Inclusion Level ◽  
Dietary Treatments ◽  
The Impact

Abstract Inclusion of soybean meal (SBM) in gestation diets has been decreasing as producers replace amino acid sources with more cost-effective ingredients. In particular, SBM components have been associated with immunoglobulin production and increased nutrition in late gestation has been associated with limited growth performance increases. Yet, it is unknown if SBM inclusion levels in late gestation diets influences offspring growth during the lactation and nursery phases. Therefore, the objective of this project is to investigate the impact of SBM inclusion rates in late gestation on offspring performance. Sows (n = 63) were assigned to one of four diets, 14 days prior to farrowing: A (n = 13; 0% SBM, 13.5% crude protein (CP), B (n = 16; 10% SBM, 13.5% CP), C (n = 17; 30% SBM, 21.5% CP), D (n = 17; 0% SBM, 21.5% CP). Growth performance of piglets was evaluated during lactation. Piglets per diet: A (n = 170), B (n = 183), C (n = 200), D (n = 228). Body weights were recorded daily from birth through d10 of lactation then at d15 and every 7 days until weaning. Colostrum and milk at d15 were evaluated for immunoglobulin concentration. After weaning, weights were recorded at two-week intervals during the nursery phase. No significant effect of gestation diet was observed for birth weight (P = 0.27) or ADG from day 0 to weaning (P = 0.78). Wean weight (WW), post-wean weight 1 (PW1), and post-wean weight 2 (PW2) were not different across dietary treatments (P &gt; 0.28). Immunoglobulin production was similar across diets. These results suggest that the inclusion rate of SBM content in the last 14 days of gestation has no impact on offspring performance. Continued research is needed into understanding the impact of nutritional status of the sow during gestation on long-term offspring performance.

scholarly journals Feeding Tall Fescue Seed during Mid and Late Gestation Influences Subsequent Postnatal Growth, Puberty, and Carcass Quality of Offspring

Animals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1859
Author(s):  
Maslyn A. Greene ◽  
Jessica L. Britt ◽  
J. Keith Bertrand ◽  
James L. Klotz ◽  
William Bridges ◽  
...  
Keyword(s):  
Tall Fescue ◽  
Average Daily Gain ◽  
Ergot Alkaloids ◽  
Postnatal Growth ◽  
Late Gestation ◽  
Carcass Quality ◽  
Muscle Weight ◽  
Ewe Lambs ◽  
Semimembranosus Muscle

Weaned lambs (n = 82), born to ewes fed endophyte-free (E−) or endophyte-infected (E+; 1.77 mg hd−1 d−1 ergovaline + ergovalinine) tall fescue seed from d 35 to 85 of gestation (MID) and/or d 86 of gestation to parturition (LATE), were used to examine how ergot alkaloid exposure during fetal development altered subsequent puberty attainment or carcass quality. Lambs were weaned at 75 d of age and separated by sex to assess puberty in ewe lambs (n = 39) and to evaluate growth, carcass and meat quality in wethers (n = 43). Data were analyzed with maternal fescue treatment, stage of gestation, and two-way interaction in the model. Age at puberty tended (P = 0.06) to be longer for ewe lambs born to dams fed E+ fescue during LATE gestation versus those fed E−. Post-weaning average daily gain tended to be higher (P = 0.07) for wether lambs born to dams fed E+ fescue seed during MID gestation compared to E−. Exposure to ergot alkaloids during fetal growth altered (P < 0.10) longissimus muscle weight and color, lipid deposition, fatty acid composition, and shear force values of semimembranosus muscle in wether lambs. These results indicate that exposure to ergot alkaloids in utero does alter subsequent post-weaning puberty attainment and body composition in offspring.

PSIII-14 Hybrid Rye Can Replace Corn in Diets for Growing Pigs Without Impacting Growth Performance Although Pigs Prefer to Eat Corn Rather Than Hybrid Rye If Given a Choice

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 174-175
Author(s):  
Molly L McGhee ◽  
Hans H Stein
Keyword(s):  
Growth Performance ◽  
Average Daily Gain ◽  
Random Effect ◽  
Basal Diet ◽  
Taste Preference ◽  
Growing Pigs ◽  
Body Weights ◽  
Hybrid Rye ◽  
Quadratic Effects ◽  
Daily Gain

Abstract Two experiments were conducted to test the hypotheses that feed preference and growth performance will not be affected if hybrid rye replaces corn in diets for growing pigs. In experiment 1, 36 pigs (32.0 ± 1.8 kg) were housed for 8 d with one gilt and one barrow in each pen. Each pen had 2 feeders containing a corn-based or a hybrid rye-based diet. Feeder positions were switched daily, and feed allotments and disappearances were recorded daily. In experiment 2, 128 pigs (27.2 ± 2.2 kg) were allotted to 32 pens with 4 pigs/pen and 8 replicate pens per diet. A corn-based basal diet and 3 diets containing 22, 45, or 67% hybrid rye were fed for 27 d. Body weights were determined at the start and conclusion of the experiment. Experiment 1 data were analyzed by a paired t-test and experiment 2 data were analyzed using SAS Proc Mixed with diet as the fixed effect and pen as a random effect. Contrast statements were used to test linear and quadratic effects of including graded levels of hybrid rye in diets. In experiment 1, preference for the hybrid rye diet was less (P &lt; 0.05) than for the corn diet on each day and for the overall experiment (Table 1). In experiment 2, body weights of pigs, average daily gain (ADG), and gain:feed did not differ among treatments. Average daily feed intake tended to decrease (linear, P &lt; 0.10) with increased hybrid rye inclusion. Taste preference and satiating effects of dietary fiber in the gastrointestinal tract may contribute to the reduced consumption of hybrid rye in both experiments. Nevertheless, the observation that diet did not influence ADG or gain:feed indicate that growing pigs may be fed diets with high inclusion rates of hybrid rye without negatively impacting growth.

scholarly journals PSVIII-20 Impact of soybean meal inclusion in late gestation on sow productivity and litter performance

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 222-223
Author(s):  
Abigail Loucks ◽  
Dana van Sambeek ◽  
Elizabeth A Hines
Keyword(s):  
Soybean Meal ◽  
Average Daily Gain ◽  
Amino Acid Profile ◽  
Late Gestation ◽  
Minimal Impact ◽  
Nutritional Needs ◽  
Inclusion Rate ◽  
Overall Performance ◽  
The Impact ◽  
Daily Gain

Abstract Soybean meal (SBM) provides essential nutritional components to the pig beyond amino acid profile. However, the expense of SBM has led to reduced use or elimination from diets of pre-farrowing sows. Therefore, the objective of this project is to investigate the impact of variable SBM inclusion rates of late gestation diets on sow productivity during farrowing and lactation. Sows were assigned to one of four diets, two weeks prior to farrowing: A (n=15; 0% SBM, 13.5% crude protein (CP), B (n=17; 10% SBM, 13.5% CP), C (n=15; 0% SBM, 21.5% CP), D (n=15; 30% SBM, 21.5% CP). At farrowing the total born (TB), born alive (BA), mummies (MM), stillborn (SB), and birth weights (BW) were recorded. After farrowing, piglet weights were recorded daily until d 10 of lactation, and then weekly until weaning. No significant effect of SBM inclusion was observed for MM, SB, or BW (P &gt; 0.44). A numerical increase in TB (P = 0.36) and BA (P = 0.11) was observed in litters produced from sows on diet D, with TB at 13.9 ±1.3, and BA at 13.3 ± 1.1, while diets A, B, and C had TB and BA ≤ 11.3 ± 1.6, and ≤ 10.2 ± 1.1, respectively. Litter BW, wean weight, and average daily gain were not different across diets (P ≥ 0.47). These results suggest that the inclusion rate of SBM has minimal impact on overall performance, however, continued research is needed into understanding the nutritional needs of a sow during late gestation.

scholarly journals 394 Exploring the relationships between cow-calf management systems as affected by protein/methionine nutrition during gestation on the performance of cow-calf pairs prior to weaning

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 158-159
Author(s):  
Kaitlyn V J Lawson ◽  
Madeline M Collins ◽  
Michaela K S Lievre ◽  
Cheryl P Campbell ◽  
Anne M Edwards ◽  
...  
Keyword(s):  
Post Partum ◽  
Beef Cows ◽  
Late Gestation ◽  
Management Systems ◽  
Protein Requirements ◽  
Body Weights ◽  
Calf Performance ◽  
Methionine Supplementation ◽  
Cow Calf ◽  
Cow Performance

Abstract A three-way factorial arrangement was used to assess impacts of protein/methionine nutrition during gestation and two lactational management systems on performance of cow-calf pairs pre-weaning. 140 crossbred beef cows were managed in drylot and randomly assigned to one of six nutritional treatments during the third trimester of gestation. Cows were fed to meet 110% (HP), 100% (MP), or 90% (LP) of metabolizable protein requirements for late-gestation (NRC, 2016), with(without) rumen-protected methionine (RPM) for 8 weeks prior to parturition. Post-partum, cow-calf pairs were managed in drylot (DL) and fed ad libitum, a ration formulated to meet lactational nutrient requirements, or rotationally grazed on pasture (PAS). Cow body weights (BW) and body condition scores (BCS) and calf BW were recorded at regular intervals. All data were analyzed using PROC GLIMMIX (SAS v9.4). HP cows were heaviest at calving (P = 0.02), but calf birthweight was unaffected by gestational nutrition (P &gt; 0.19). Gestational nutrition did not impact cow conception rate (CR), or calf BW and ADG (P &gt; 0.17). Lactational management system (PAS, DL) did not affect cow BCS or CR (P &gt; 0.13), but impacted cow and calf BW and ADG. PAS calves were heavier, had greater ADG, and heavier weaning BW than DL calves (P &lt; 0.02). This came at the expense of BW loss throughout lactation and lower ADG for PAS cows, versus BW gains and greater ADG for DL cows (P &lt; 0.0001). An interaction between protein level and RPM supplementation was present for cow BW at calving and weaning, and BW change throughout lactation (P &lt; 0.04), with tendencies for interactions for cow ADG and BCS (P &lt; 0.09). Overall, prepartum protein/methionine supplementation did not affect calf performance prior to weaning, but may have affected cow performance during lactation. Rotationally grazing cow-calf pairs on pasture improved pre-weaning calf gains, but reduced cow gains throughout lactation.

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