Effects of monensin inclusion and level of intake in limit-feeding strategies for beef cows1

Boardman, C. J.; Wickersham, T.A.; Trubenbach, L. A.; Sawyer, J. E.

doi:10.1093/tas/txaa108

Cited by 5 publications

(12 citation statements)

References 24 publications

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“…Differences were not observed between treatments for GE digestibility, and DE and ME were calculated from digestibility of GE. When this diet was fed at the same level of restriction, Trubenbach et al (2019) and Boardman et al (2020) observed OM digestion (71.7% and 76.7%, respectively) and GE (68.6% and 75.2%, respectively) compared to those in the present study. In our experiment, energy availability was not altered by the time concentrate was delivered (2.54 Mcal ME/kg DM), but was approximately 10% greater than observed in the prior studies ( Trubenbach et al, 2019 ; Boardman et al, 2020 ; 2.18 and 2.38 Mcal ME/kg DM, respectively).…”

Section: Discussioncontrasting

confidence: 48%

“…Each of the four, 20-d experimental periods in the Latin Square comprised 11 d adaptation to treatments ( Trubenbach et al, 2019 ; Boardman et al, 2020 ), 7 d for intake and digestion measurements, 1 d for ruminal fermentation profile measurement, and 1 d for rumen fill and solid passage measurement. Intake and digestion observations were made on d 12 through 18.…”

Section: Methodsmentioning

confidence: 99%

“…Previous research in our laboratory demonstrated that beef cows limit fed a complete diet (1.54 Mcal NE m /kg) at 80% of NE m requirements had reduced apparent maintenance requirements compared to NASEM (2016) predictions ( Trubenbach et al, 2019 ). An additional benefit of limit-fed systems is increased diet digestion ( Galyean et al, 1979 ; Zinn and Owens, 1983 ; Boardman et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Effect of feeding method on nutrient utilization and cow performance in limit-fed cow-calf systems

Baber

Sawyer

Trubenbach

et al. 2021

Translational Animal Science

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Delivery of limit-fed, complete rations requires significant capital investment and creates logistical challenges for producers. Deconstruction and separate delivery of roughage and concentrate portions of diets may decrease feeding cost. Two experiments were conducted to evaluate the potential of separately limit-feeding roughage and concentrate. In Experiment 1, 4 ruminally cannulated steers (371 ± 12 kg BW) were used in a 4 × 4 Latin square to evaluate the effects of time of concentrate delivery in deconstructed diets. Intake was restricted to 80% of predicted NEm requirements of a diet consisting of wheat straw (35%), cracked corn (29%), and distillers’ grains (27%) formulated to contain 1.58 Mcal NEm/kg. Treatments were: concentrate fed 2 h prior to wheat straw (-2S), concentrate and wheat straw fed as total mixed ration (TMR), concentrate fed 2 h after wheat straw (+2S), and concentrate fed 12 h after wheat straw (+12S). In Experiment 2, 95 mid- to late-gestation cows (503 ± 151 kg) were used in a 112-d trial to evaluate feeding system on cow performance. Cows were assigned to 1 of 12 pens. Treatments were limit-fed the complete diet from Experiment 1 (TMR), fed roughage and concentrate portions of the deconstructed TMR 12 h apart (SEP), and ad libitum bermudagrass hay (HAY). Body weight, BCS, and back fat measures were collected every 28 d. In Experiment 1, treatment did not affect DM or OM digestion (P ≥ 0.88), rate of particulate passage (P ≥ 0.55), or ruminal DM fill (P ≥ 0.19). Fill averaged 3.8 kg DM. Nadir of ruminal pH occurred 4 to 8 h after concentrate was delivered, but mean ruminal pH was not different among treatments (P = 0.22) ranging from 6.4 to 6.6 for +2S and 12S, respectively. In Experiment 2, treatment did not affect final BW (518 kg; P = 0.72) or final BCS (5.6; P = 0.67), but limit-fed strategies tended (P = 0.06) to have greater final RE (137.1, 98.9 and -14.6 Mcal for TMR, SEP, and HAY, respectively). Delivering forage and concentrate separately did not change digestion, and timing of concentrate delivery had only minor effects on ruminal fermentation. Limit-feeding a TMR or separate delivery of roughage and concentrate sustained cow performance compared to ad libitum hay consumption.

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Section: Discussioncontrasting

confidence: 48%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of feeding method on nutrient utilization and cow performance in limit-fed cow-calf systems

Baber

Sawyer

Trubenbach

et al. 2021

Translational Animal Science

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“…Pregnant recipients were assigned to receive either 100% (control; n = 9) or 70% (restricted; n = 9) of their total energy requirements according to standard beef cattle nutritional models [ 3 ] from GD 158 through parturition ( Table 1 ). The restriction to 70% of NRC predicted requirements was chosen based on observations that restriction to 80% during mid to late gestation had minimal effect on maternal energy retention due to apparent adaptation in maintenance demand [ 1 , 2 ]. Requirements were estimated per individual based on body weight, and each individual was provided a prescribed daily ration to achieve treatment levels of energy intake (1.54 Mcal/kg NEm = 100%).…”

Section: Methodsmentioning

confidence: 99%

“…Worldwide demand for protein continues to grow as land and other resources become increasingly scarce. These accelerating trends have turned producers’ attention to implementing confinement, or semi-confinement feeding in an attempt to increase production per unit area of land, and improve animal nutrient utilization by reducing feed intake [ 1 , 2 ]. Semi-confinement feeding allows for a high degree of control over nutritional management and affords producers the potential opportunity to significantly improve the efficiency of nutrient utilization in beef cows.…”

Section: Introductionmentioning

confidence: 99%

Maternal nutrient restriction in late pregnancy programs postnatal metabolism and pituitary development in beef heifers

et al. 2021

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Maternal undernutrition during pregnancy followed by ad libitum access to nutrients during postnatal life induces postnatal metabolic disruptions in multiple species. Therefore, an experiment was conducted to evaluate postnatal growth, metabolism, and development of beef heifers exposed to late gestation maternal nutrient restriction. Pregnancies were generated via transfer of in vitro embryos produced using X-bearing sperm from a single Angus sire. Pregnant dams were randomly assigned to receive either 100% (control; n = 9) or 70% (restricted; n = 9) of their total energy requirements from gestational day 158 to parturition. From post-natal day (PND) 301 until slaughter (PND485), heifers were individually fed ad libitum in a Calan gate facility. Calves from restricted dams were lighter than controls at birth (P<0.05) through PND70 (P<0.05) with no difference in body weight from PND105 through PND485 (P>0.10). To assess pancreatic function, glucose tolerance tests were performed on PND315 and PND482 and a diet effect was seen with glucose area under the curve being greater (P<0.05) in calves born to restricted dams compared to controls. At slaughter, total internal fat was greater (P<0.05) in heifers born to restricted dams, while whole pituitary weight was lighter (P<0.05). Heifers from restricted dams had fewer growth hormone-positive cells (somatotrophs) compared to controls (P<0.05). Results demonstrate an impaired ability to clear peripheral glucose in heifers born to restricted dams leading to increased deposition of internal fat. A reduction in the number of somatotrophs may contribute to the adipogenic phenotype of heifers born to restricted dams due to growth hormone’s known anabolic roles in growth, lipolysis, and pancreatic islet function.

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Evaluation of Black Soldier Fly larvae (Hermetia illucens) as a protein supplement for beef steers consuming low-quality forage

Fukuda

Cox

Wickersham

et al. 2022

Translational Animal Science

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Black Soldier Fly larvae (BSFL; Hermetia illucens) has been the focus of recent feeding trials in poultry, swine, and fish; however, in vivo research has not yet been conducted in cattle. Accordingly, a study was conducted to evaluate the effects of BSFL as a protein supplement in beef steers. Six steers (603 ± 20 kg of BW, n = 3 and 404 ± 17 kg of BW, n = 3) consuming King Ranch bluestem hay (6.55% dry matter [DM] crude protein [CP]) ad libitum were used in two simultaneous 3 × 3 Latin squares. Steers were provided one of three treatments each period: 1) a control with no supplement (CON), 2) a supplement comprised of conventional feed ingredients with whole cottonseed and soybean meal as the main protein sources (CONV), and 3) a supplement with BSFL as the main protein source (BSFL). Three 14-d periods were conducted with 8-d to adapt to treatments, 5-d to measure intake and digestion, and 1-d to complete a ruminal fermentation profile. DM, organic matter (OM), CP, neutral detergent fiber (NDF), and acid detergent insoluble ash were determined in forage, supplement, ort, and fecal samples. Protein supplementation as CONV or BSFL stimulated forage OM intake (P ≤ 0.01) relative to CON with a trend for a difference (P = 0.08) between the supplements such that CONV steers consumed more FOMI than BSFL steers. Treatment affected total digestible OM intake (TDOMI; P ≤ 0.01); TDOMI for CON steers was 47.5 g/kg metabolic body weight (MBW) which was significantly less (P ≤ 0.01) than that of CONV or BSFL steers. Steers supplemented with CONV consumed significantly more TDOMI than BSFL steers (P = 0.05; 62.2 vs. 60.1 g/kg MBW, respectively). Treatment did not significantly affect digestibility of DM, OM, or NDF (P > 0.32). There was also not a significant effect (P ≥ 0.17) of treatment on ruminal ammonia-N, total volatile fatty acids, or ruminal pH. Overall, this data indicates BSFL may be an effective protein supplement for beef cattle consuming low-quality forage.

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Effects of monensin inclusion and level of intake in limit-feeding strategies for beef cows1

Cited by 5 publications

References 24 publications

Effect of feeding method on nutrient utilization and cow performance in limit-fed cow-calf systems

Effect of feeding method on nutrient utilization and cow performance in limit-fed cow-calf systems

Maternal nutrient restriction in late pregnancy programs postnatal metabolism and pituitary development in beef heifers

Evaluation of Black Soldier Fly larvae (Hermetia illucens) as a protein supplement for beef steers consuming low-quality forage

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