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Bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet

Bunk requirements for optimal growth performance of growing calves limit-fed high-energy corn and corn co-product diets have not been widely evaluated. Three-hundred eighty-five crossbred steers (initial body weight = 215 ± 25 kg) were purchased in Texas, transported to the Kansas State Beef Stocker...

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Autores principales: Duncan, Zachary M, DeBord, Zachary L, Pflughoeft, Madison G, Suhr, Kyler J, Hollenbeck, William R, Tarpoff, Anthony J, Olson, K C, Blasi, Dale A
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9354967/
https://www.ncbi.nlm.nih.gov/pubmed/35949915
http://dx.doi.org/10.1093/tas/txac096
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author Duncan, Zachary M
DeBord, Zachary L
Pflughoeft, Madison G
Suhr, Kyler J
Hollenbeck, William R
Tarpoff, Anthony J
Olson, K C
Blasi, Dale A
author_facet Duncan, Zachary M
DeBord, Zachary L
Pflughoeft, Madison G
Suhr, Kyler J
Hollenbeck, William R
Tarpoff, Anthony J
Olson, K C
Blasi, Dale A
author_sort Duncan, Zachary M
collection PubMed
description Bunk requirements for optimal growth performance of growing calves limit-fed high-energy corn and corn co-product diets have not been widely evaluated. Three-hundred eighty-five crossbred steers (initial body weight = 215 ± 25 kg) were purchased in Texas, transported to the Kansas State Beef Stocker Unit, and weighed at arrival. Steers were stratified by body weight and randomly assigned to 1 of 28 pens containing 12 to 14 head. Within block, pens were randomly assigned to one of four bunk allotment treatments: 25.4, 38.1, 50.8, or 63.5 cm of bunk per head for a 58-d receiving period. Calves were fed at 0700 h once daily at 1.8% of bodyweight (dry matter basis) from February 2 to March 13, 2021; thereafter the daily feed allotment was increased to 2.0% of bodyweight. The diet contained (dry matter basis) 39.5% dry-rolled corn, 7.5% supplement, 40% wet corn gluten feed, and 13% prairie hay. Steers were individually weighed on days 29 and 58 and pen weights were measured weekly to determine feed offered for the following week. Body weights on days 29 and 58, dry matter intake, or gain-to-feed ratio during the receiving period did not differ (P ≥ 0.34) between treatments. During the first 29 d, average daily gain (ADG) increased linearly as bunk space increased (P = 0.03); however, no treatment effects were observed thereafter. In addition, ADG standard deviation from days 0 to 29 responded quadratically (P = 0.05) where ADG standard deviation tended to be greater in the 38.1-cm allotment and was greater in the 50.8-cm allotment compared to the 25.4-cm allotment (P = 0.07 and P = 0.04, respectively). Bunk score tended to decrease linearly as bunk allotment decreased (P = 0.06). Following the receiving period, steers were blocked by bunk treatment and randomly assigned to 1 of 18 pastures. Steers were grazed for 90-d from May to August at a targeted stocking density of 280 kg live-weight ˖ ha(–1). During the grazing season, ADG increased linearly with reduced (P < 0.01) bunk allotment; however, body weights did not differ (P = 0.91) between bunk treatments at the completion of the grazing period. In addition, overall total body weight gains and ADG from the receiving and grazing periods did not differ (P > 0.57) between bunk treatments. We interpreted our data to suggest that bunk space allotments of 25.4 to 63.5 cm per head had minimal impact on growth performance during a 58-d receiving period and did not affect final body weights following a 90-d grazing season.
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spelling pubmed-93549672022-08-09 Bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet Duncan, Zachary M DeBord, Zachary L Pflughoeft, Madison G Suhr, Kyler J Hollenbeck, William R Tarpoff, Anthony J Olson, K C Blasi, Dale A Transl Anim Sci Ruminant Nutrition Bunk requirements for optimal growth performance of growing calves limit-fed high-energy corn and corn co-product diets have not been widely evaluated. Three-hundred eighty-five crossbred steers (initial body weight = 215 ± 25 kg) were purchased in Texas, transported to the Kansas State Beef Stocker Unit, and weighed at arrival. Steers were stratified by body weight and randomly assigned to 1 of 28 pens containing 12 to 14 head. Within block, pens were randomly assigned to one of four bunk allotment treatments: 25.4, 38.1, 50.8, or 63.5 cm of bunk per head for a 58-d receiving period. Calves were fed at 0700 h once daily at 1.8% of bodyweight (dry matter basis) from February 2 to March 13, 2021; thereafter the daily feed allotment was increased to 2.0% of bodyweight. The diet contained (dry matter basis) 39.5% dry-rolled corn, 7.5% supplement, 40% wet corn gluten feed, and 13% prairie hay. Steers were individually weighed on days 29 and 58 and pen weights were measured weekly to determine feed offered for the following week. Body weights on days 29 and 58, dry matter intake, or gain-to-feed ratio during the receiving period did not differ (P ≥ 0.34) between treatments. During the first 29 d, average daily gain (ADG) increased linearly as bunk space increased (P = 0.03); however, no treatment effects were observed thereafter. In addition, ADG standard deviation from days 0 to 29 responded quadratically (P = 0.05) where ADG standard deviation tended to be greater in the 38.1-cm allotment and was greater in the 50.8-cm allotment compared to the 25.4-cm allotment (P = 0.07 and P = 0.04, respectively). Bunk score tended to decrease linearly as bunk allotment decreased (P = 0.06). Following the receiving period, steers were blocked by bunk treatment and randomly assigned to 1 of 18 pastures. Steers were grazed for 90-d from May to August at a targeted stocking density of 280 kg live-weight ˖ ha(–1). During the grazing season, ADG increased linearly with reduced (P < 0.01) bunk allotment; however, body weights did not differ (P = 0.91) between bunk treatments at the completion of the grazing period. In addition, overall total body weight gains and ADG from the receiving and grazing periods did not differ (P > 0.57) between bunk treatments. We interpreted our data to suggest that bunk space allotments of 25.4 to 63.5 cm per head had minimal impact on growth performance during a 58-d receiving period and did not affect final body weights following a 90-d grazing season. Oxford University Press 2022-07-27 /pmc/articles/PMC9354967/ /pubmed/35949915 http://dx.doi.org/10.1093/tas/txac096 Text en © The Author(s) 2022. Published by Oxford University Press on behalf of the American Society of Animal Science. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Ruminant Nutrition
Duncan, Zachary M
DeBord, Zachary L
Pflughoeft, Madison G
Suhr, Kyler J
Hollenbeck, William R
Tarpoff, Anthony J
Olson, K C
Blasi, Dale A
Bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet
title Bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet
title_full Bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet
title_fullStr Bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet
title_full_unstemmed Bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet
title_short Bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet
title_sort bunk space requirements for growing beef cattle limit-fed a high-energy corn and corn co-product diet
topic Ruminant Nutrition
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9354967/
https://www.ncbi.nlm.nih.gov/pubmed/35949915
http://dx.doi.org/10.1093/tas/txac096
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