Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.

Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.

The objective of the present study was to evaluate two energy intake levels during the last third of gestation of beef cows was evaluated on placental characteristics, ethological and morphometric variables of their female calves. Thirty-one British multiparous cows, inseminated at fixed time and carrying females were assigned on Day –90 (Day 0=delivery) to two levels of energy intake until delivery: i- 125% of the requirements (ALTA; n=15) and ii- 75% of the requirements (BAJA; n=16). In the cows, live weight (PV), body condition score (CC), concentration of unesterified fatty acids (AGNE) and insulin were recorded. Placenta (weight, number of cotyledons and placental efficiency) was characterized and morphometric and behavioural measures were evaluated within the first 24 hours of calf life. At calving, BAJA cows had a higher concentration of AGNE (0.45±0.03 vs 0.27±0.03 mmol/L, P<0.01) and lower insulin (8.83±0.73 vs 10.88±0.71 uIU/ml, P<0.03), as well as lower PV (478±15.4 vs 521±11.8 kg, P<0.01) and CC (3.9±0.08 vs 4.5±0.06 u; P<0.01) compared to ALTA cows. The characteristics evaluated in the placentas were not affected by treatments, nor was the PV of the calves at birth. In the same way, none of the morphometric or behavioural variables was significantly affected by the treatments. In the present experiment, the undernourished cows mobilized body reserve during the last third of gestation to protect the integrity of their offspring, verified by the absence of differences in the parameters evaluated. Possibly, cows grazing native pastures develop mechanisms of accumulation and mobilization of body reserves that allow them, at least for the conditions of the present study, to overcome periods of forage shortage as an adaptation strategy.

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Main Authors: Batista, Carlos, Velazco, José Ignacio, Baldi, Fernando, Banchero, Georgget, Quintans, Graciela
Format: Digital revista
Language:spa
Published: Asociacion Latinoamericana de Produccion Animal 2020
Online Access:https://ojs.alpa.uy/index.php/ojs_files/article/view/2781
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id oai:ojs.ojs.alpa.uy:article-2781
record_format ojs
institution ALPA
collection OJS
country Uruguay
countrycode UY
component Revista
access En linea
databasecode rev-alpa
tag revista
region America del Sur
libraryname Biblioteca ALPA
language spa
format Digital
author Batista, Carlos
Velazco, José Ignacio
Baldi, Fernando
Banchero, Georgget
Quintans, Graciela
spellingShingle Batista, Carlos
Velazco, José Ignacio
Baldi, Fernando
Banchero, Georgget
Quintans, Graciela
Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.
author_facet Batista, Carlos
Velazco, José Ignacio
Baldi, Fernando
Banchero, Georgget
Quintans, Graciela
author_sort Batista, Carlos
title Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.
title_short Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.
title_full Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.
title_fullStr Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.
title_full_unstemmed Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.
title_sort effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth.
description The objective of the present study was to evaluate two energy intake levels during the last third of gestation of beef cows was evaluated on placental characteristics, ethological and morphometric variables of their female calves. Thirty-one British multiparous cows, inseminated at fixed time and carrying females were assigned on Day –90 (Day 0=delivery) to two levels of energy intake until delivery: i- 125% of the requirements (ALTA; n=15) and ii- 75% of the requirements (BAJA; n=16). In the cows, live weight (PV), body condition score (CC), concentration of unesterified fatty acids (AGNE) and insulin were recorded. Placenta (weight, number of cotyledons and placental efficiency) was characterized and morphometric and behavioural measures were evaluated within the first 24 hours of calf life. At calving, BAJA cows had a higher concentration of AGNE (0.45±0.03 vs 0.27±0.03 mmol/L, P<0.01) and lower insulin (8.83±0.73 vs 10.88±0.71 uIU/ml, P<0.03), as well as lower PV (478±15.4 vs 521±11.8 kg, P<0.01) and CC (3.9±0.08 vs 4.5±0.06 u; P<0.01) compared to ALTA cows. The characteristics evaluated in the placentas were not affected by treatments, nor was the PV of the calves at birth. In the same way, none of the morphometric or behavioural variables was significantly affected by the treatments. In the present experiment, the undernourished cows mobilized body reserve during the last third of gestation to protect the integrity of their offspring, verified by the absence of differences in the parameters evaluated. Possibly, cows grazing native pastures develop mechanisms of accumulation and mobilization of body reserves that allow them, at least for the conditions of the present study, to overcome periods of forage shortage as an adaptation strategy.
publisher Asociacion Latinoamericana de Produccion Animal
publishDate 2020
url https://ojs.alpa.uy/index.php/ojs_files/article/view/2781
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spelling oai:ojs.ojs.alpa.uy:article-27812021-09-17T16:49:47Z Effect of two energy levels during the last third of gestation of beef cows on characteristics of the placenta and offspring at birth. Efecto de dos niveles de energía durante el último tercio de gestación de vacas para carne sobre características de la placenta y la descendencia al nacimiento. Efeito de dois níveis de energia durante o último terço da gestação de vacas de corte sobre as características da placenta e da prole ao nascimento. Batista, Carlos Velazco, José Ignacio Baldi, Fernando Banchero, Georgget Quintans, Graciela progenie grazing breeding cows undernutrition subnutricion progenie pastoreo vacas de cria The objective of the present study was to evaluate two energy intake levels during the last third of gestation of beef cows was evaluated on placental characteristics, ethological and morphometric variables of their female calves. Thirty-one British multiparous cows, inseminated at fixed time and carrying females were assigned on Day –90 (Day 0=delivery) to two levels of energy intake until delivery: i- 125% of the requirements (ALTA; n=15) and ii- 75% of the requirements (BAJA; n=16). In the cows, live weight (PV), body condition score (CC), concentration of unesterified fatty acids (AGNE) and insulin were recorded. Placenta (weight, number of cotyledons and placental efficiency) was characterized and morphometric and behavioural measures were evaluated within the first 24 hours of calf life. At calving, BAJA cows had a higher concentration of AGNE (0.45±0.03 vs 0.27±0.03 mmol/L, P<0.01) and lower insulin (8.83±0.73 vs 10.88±0.71 uIU/ml, P<0.03), as well as lower PV (478±15.4 vs 521±11.8 kg, P<0.01) and CC (3.9±0.08 vs 4.5±0.06 u; P<0.01) compared to ALTA cows. The characteristics evaluated in the placentas were not affected by treatments, nor was the PV of the calves at birth. In the same way, none of the morphometric or behavioural variables was significantly affected by the treatments. In the present experiment, the undernourished cows mobilized body reserve during the last third of gestation to protect the integrity of their offspring, verified by the absence of differences in the parameters evaluated. Possibly, cows grazing native pastures develop mechanisms of accumulation and mobilization of body reserves that allow them, at least for the conditions of the present study, to overcome periods of forage shortage as an adaptation strategy. El objetivo del presente trabajo fue evaluar dos niveles de energía en la dieta de vacas para carne durante el último tercio de gestación, sobre características de la placenta, variables etológicas y morfométricas de sus hijas. Treinta y una vacas británicas multíparas, inseminadas a tiempo fijo y gestando hembras fueron asignadas el Día –90 (Día 0=parto) a dos niveles de consumo de energía relativo a los requerimientos de mantenimiento hasta el parto: i- 125% (ALTO; n=15) y ii- 75% (BAJO; n=16). En las vacas se registró peso vivo (PV), condición corporal (CC), concentración de ácidos grasos no esterificados (AGNE) e insulina. Se caracterizaron las placentas (peso, numero de cotiledones y eficiencia placentaria) y se evaluaron medidas morfométricas y comportamentales de las terneras en sus primeras 24 horas de vida. Al parto, las vacas de BAJO presentaron mayor concentración de AGNE (0,45±0,03 vs 0,27±0,03 mmol/L, P<0,01) y menor de insulina (8,83±0,73 vs 10,88±0,71 uIU/ml, P<0,03), así como menor PV (478±15,4 vs 521±11,8 kg, P<0,01) y CC (3,9±0,08 vs 4,5±0,06 u; P<0,01) respecto a las vacas de ALTO. Las características evaluadas en las placentas no fueron afectadas por los tratamientos como tampoco lo fue el PV de las terneras al nacimiento. De la misma forma, ninguna de las variables morfométricas ni comportamentales fue afectada significativamente por los tratamientos. En el presente experimento, las vacas subalimentadas movilizaron reserva corporal durante el último tercio de gestación para resguardar la integridad de sus crías verificado por la ausencia de diferencias en los parámetros evaluados. Posiblemente las vacas pastoreando campo nativo desarrollen mecanismos de acumulación y movilización de reservas corporales que les permite, al menos para las condiciones del presente estudio, sobreponerse a los períodos de escasez de forraje como estrategia de adaptación. O objetivo do presente trabalho foi avaliar dois níveis de energia na dieta de vacas de corte durante o último terço da gestação, sobre as características da placenta, variáveis ​​etológicas e morfométricas de suas filhas. Trinta e uma vacas britânicas multíparas, inseminadas em um tempo fixo e fêmeas em gestação, foram designadas no Dia -90 (Dia 0 = parto) a dois níveis de consumo de energia em relação às necessidades de manutenção até o parto: i- 125% (ALTO; n = 15) e ii- 75% (BAIXO; n = 16). Peso vivo (PV), condição corporal (CC), concentração de ácidos graxos não esterificados (AGNE) e insulina foram registrados nas vacas. As placentas (peso, número de cotilédones e eficiência placentária) foram caracterizadas e medidas morfométricas e comportamentais dos bezerros foram avaliadas nas primeiras 24 horas de vida. No parto, as vacas BAIXAS tiveram uma concentração maior de AGNE (0,45 ± 0,03 vs 0,27 ± 0,03 mmol / L, P <0,01) e insulina mais baixa (8,83 ± 0,73 vs 10,88 ± 0,71 uIU / ml, P <0,03), também como menor PV (478 ± 15,4 vs 521 ± 11,8 kg, P <0,01) e CC (3,9 ± 0,08 vs 4,5 ± 0,06 u; P <0,01) em relação às vacas HIGH. As características avaliadas nas placentas não foram afetadas pelos tratamentos, nem o PV dos bezerros ao nascimento. Da mesma forma, nenhuma das variáveis ​​morfométricas ou comportamentais foi significativamente afetada pelos tratamentos. No presente experimento, as vacas desnutridas mobilizaram reserva corporal durante o último terço da gestação para proteger a integridade de seus bezerros, verificada pela ausência de diferenças nos parâmetros avaliados. Possivelmente vacas em pastagens nativas desenvolvam mecanismos de acumulação e mobilização de reservas corporais que lhes permitem, pelo menos nas condições do presente estudo, superar períodos de escassez de forragem como estratégia de adaptação. Asociacion Latinoamericana de Produccion Animal 2020-08-17 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Text Articulo cientifico original Texto application/pdf text/html text/xml https://ojs.alpa.uy/index.php/ojs_files/article/view/2781 Latin American Archives of Animal Production; Vol. 28 No. 1-2 (2020); 9-18 Archivos Latinoamericanos de Producción Animal; Vol. 28 Núm. 1-2 (2020); 9-18 2075-8359 1022-1301 spa https://ojs.alpa.uy/index.php/ojs_files/article/view/2781/1278 https://ojs.alpa.uy/index.php/ojs_files/article/view/2781/1327 https://ojs.alpa.uy/index.php/ojs_files/article/view/2781/1462 Copyright (c) 2020 Carlos Batista, José Ignacio Velazco, Fernando Baldi, Georgget Banchero, Graciela Quintans https://creativecommons.org/licenses/by-nc-sa/4.0

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