Dystocia in 3-year old beef heifers: Relationship to maternal nutrient intake during early - and mid-gestation, pelvic area and hormonal indicators of placental function

G.C. Micke, T.M. Sullivan, P.J. Rolls, B. Hasell, R.M. Greer, Scott Norman, V.E.A. Perry

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

-year-old Bos indicus × Bos taurus heifers may be useful for identifying heifers at an increased risk of dystocia and (b) increased ES and bPL concentrations at calving are associated with increased risk of dystocia. Pelvic area measurements obtained prior to conception remain valid in their assessment of the relationship between pelvic area and likelihood of dystocia occurring in the event of changing maternal nutrient intake during gestation. This is an important finding given maternal diets high in protein and energy during the second trimester of gestation increased calf birth weight and calf birth weight was associated with an increase in the occurrence of dystocia in heifers calving as 3-year oldsThe influence of nutrition during the first and second trimesters of gestation on the occurrence of dystocia was investigated in 3-year-old composite-breed beef heifers. Heifers were allocated according to stratification by weight and genotype to either a high (H/- = 76 MJ metabolisable energy (ME) and 1.4 kg crude protein (CP)), or low (L/- = 62 MJ ME and 0.4 kg CP daily) nutritional treatment on the day of artificial insemination (day 0) to the same Senepol bull. Half of each nutritional group changed to an opposite nutritional group on day 93 of gestation (-/H = 82 MJ ME and 1.4 kg CP; -/L = 63 MJ ME and 0.4 kg CP daily), resulting in four treatment groups: HH (n = 16); HL (n = 19); LH (n = 17); LL (n = 19). From 180 days until calving all heifers were fed the same diets. Pelvic area measures were taken at heifer selection (-72 days) and at 117 days. Maternal circulating concentrations of estrone sulphate (ES), bovine placental lactogen (bPL), bovine pregnancy associated glycoprotein and progesterone were monitored throughout gestation. Heifers were observed continuously over the calving period and delivery type classified as being either eutocic or dystocic. The occurrence of dystocia was 14.1%. Increased calf birth weight increased the odds of occurrence of dystocia (odds ratio (OR) = 1.40; 95% confidence interval (95% CI) 1.12-1.76; P < 0.01). High diets in the second trimester were associated with heavier calves at birth (P = 0.01). The mean pelvic area of eutocic heifers on -72 d, tended to be greater compared to that of dystocic heifers (P = 0.08) such that a 1-cm2 difference in pelvic area tended to decrease the risk of dystocia (OR = 0.97; 95% CI 0.93-1.01; P = 0.09). Longer gestation length was associated with an increased risk of dystocia (P = 0.03). ES (P = 0.04) and bPL (P = 0.09) at calving were positively associated with the risk of dystocia. In conclusion, the current study demonstrates (a) that pelvic area measurement at selection in 3
Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalAnimal Reproduction Science
Volume118
Issue number2-4
DOIs
Publication statusPublished - Apr 2010

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Dystocia
dystocia
nutrient intake
beef cattle
heifers
Mothers
pregnancy
Food
Pregnancy
choriomammotropin
calving
Placental Lactogen
metabolizable energy
estrone
Second Pregnancy Trimester
crude protein
Birth Weight
birth weight
calves
cattle

Cite this

@article{b835f7f976ab4b289f6ec25e6a5c56e1,
title = "Dystocia in 3-year old beef heifers: Relationship to maternal nutrient intake during early - and mid-gestation, pelvic area and hormonal indicators of placental function",
abstract = "-year-old Bos indicus {\~A}— Bos taurus heifers may be useful for identifying heifers at an increased risk of dystocia and (b) increased ES and bPL concentrations at calving are associated with increased risk of dystocia. Pelvic area measurements obtained prior to conception remain valid in their assessment of the relationship between pelvic area and likelihood of dystocia occurring in the event of changing maternal nutrient intake during gestation. This is an important finding given maternal diets high in protein and energy during the second trimester of gestation increased calf birth weight and calf birth weight was associated with an increase in the occurrence of dystocia in heifers calving as 3-year oldsThe influence of nutrition during the first and second trimesters of gestation on the occurrence of dystocia was investigated in 3-year-old composite-breed beef heifers. Heifers were allocated according to stratification by weight and genotype to either a high (H/- = 76 MJ metabolisable energy (ME) and 1.4 kg crude protein (CP)), or low (L/- = 62 MJ ME and 0.4 kg CP daily) nutritional treatment on the day of artificial insemination (day 0) to the same Senepol bull. Half of each nutritional group changed to an opposite nutritional group on day 93 of gestation (-/H = 82 MJ ME and 1.4 kg CP; -/L = 63 MJ ME and 0.4 kg CP daily), resulting in four treatment groups: HH (n = 16); HL (n = 19); LH (n = 17); LL (n = 19). From 180 days until calving all heifers were fed the same diets. Pelvic area measures were taken at heifer selection (-72 days) and at 117 days. Maternal circulating concentrations of estrone sulphate (ES), bovine placental lactogen (bPL), bovine pregnancy associated glycoprotein and progesterone were monitored throughout gestation. Heifers were observed continuously over the calving period and delivery type classified as being either eutocic or dystocic. The occurrence of dystocia was 14.1{\%}. Increased calf birth weight increased the odds of occurrence of dystocia (odds ratio (OR) = 1.40; 95{\%} confidence interval (95{\%} CI) 1.12-1.76; P < 0.01). High diets in the second trimester were associated with heavier calves at birth (P = 0.01). The mean pelvic area of eutocic heifers on -72 d, tended to be greater compared to that of dystocic heifers (P = 0.08) such that a 1-cm2 difference in pelvic area tended to decrease the risk of dystocia (OR = 0.97; 95{\%} CI 0.93-1.01; P = 0.09). Longer gestation length was associated with an increased risk of dystocia (P = 0.03). ES (P = 0.04) and bPL (P = 0.09) at calving were positively associated with the risk of dystocia. In conclusion, the current study demonstrates (a) that pelvic area measurement at selection in 3",
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Dystocia in 3-year old beef heifers : Relationship to maternal nutrient intake during early - and mid-gestation, pelvic area and hormonal indicators of placental function. / Micke, G.C.; Sullivan, T.M.; Rolls, P.J.; Hasell, B.; Greer, R.M.; Norman, Scott; Perry, V.E.A.

In: Animal Reproduction Science, Vol. 118, No. 2-4, 04.2010, p. 163-170.

Research output: Contribution to journalArticle

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T1 - Dystocia in 3-year old beef heifers

T2 - Relationship to maternal nutrient intake during early - and mid-gestation, pelvic area and hormonal indicators of placental function

AU - Micke, G.C.

AU - Sullivan, T.M.

AU - Rolls, P.J.

AU - Hasell, B.

AU - Greer, R.M.

AU - Norman, Scott

AU - Perry, V.E.A.

N1 - Imported on 12 Apr 2017 - DigiTool details were: month (773h) = April 2010; Journal title (773t) = Animal Reproduction Science. ISSNs: 0378-4320;

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N2 - -year-old Bos indicus × Bos taurus heifers may be useful for identifying heifers at an increased risk of dystocia and (b) increased ES and bPL concentrations at calving are associated with increased risk of dystocia. Pelvic area measurements obtained prior to conception remain valid in their assessment of the relationship between pelvic area and likelihood of dystocia occurring in the event of changing maternal nutrient intake during gestation. This is an important finding given maternal diets high in protein and energy during the second trimester of gestation increased calf birth weight and calf birth weight was associated with an increase in the occurrence of dystocia in heifers calving as 3-year oldsThe influence of nutrition during the first and second trimesters of gestation on the occurrence of dystocia was investigated in 3-year-old composite-breed beef heifers. Heifers were allocated according to stratification by weight and genotype to either a high (H/- = 76 MJ metabolisable energy (ME) and 1.4 kg crude protein (CP)), or low (L/- = 62 MJ ME and 0.4 kg CP daily) nutritional treatment on the day of artificial insemination (day 0) to the same Senepol bull. Half of each nutritional group changed to an opposite nutritional group on day 93 of gestation (-/H = 82 MJ ME and 1.4 kg CP; -/L = 63 MJ ME and 0.4 kg CP daily), resulting in four treatment groups: HH (n = 16); HL (n = 19); LH (n = 17); LL (n = 19). From 180 days until calving all heifers were fed the same diets. Pelvic area measures were taken at heifer selection (-72 days) and at 117 days. Maternal circulating concentrations of estrone sulphate (ES), bovine placental lactogen (bPL), bovine pregnancy associated glycoprotein and progesterone were monitored throughout gestation. Heifers were observed continuously over the calving period and delivery type classified as being either eutocic or dystocic. The occurrence of dystocia was 14.1%. Increased calf birth weight increased the odds of occurrence of dystocia (odds ratio (OR) = 1.40; 95% confidence interval (95% CI) 1.12-1.76; P < 0.01). High diets in the second trimester were associated with heavier calves at birth (P = 0.01). The mean pelvic area of eutocic heifers on -72 d, tended to be greater compared to that of dystocic heifers (P = 0.08) such that a 1-cm2 difference in pelvic area tended to decrease the risk of dystocia (OR = 0.97; 95% CI 0.93-1.01; P = 0.09). Longer gestation length was associated with an increased risk of dystocia (P = 0.03). ES (P = 0.04) and bPL (P = 0.09) at calving were positively associated with the risk of dystocia. In conclusion, the current study demonstrates (a) that pelvic area measurement at selection in 3

AB - -year-old Bos indicus × Bos taurus heifers may be useful for identifying heifers at an increased risk of dystocia and (b) increased ES and bPL concentrations at calving are associated with increased risk of dystocia. Pelvic area measurements obtained prior to conception remain valid in their assessment of the relationship between pelvic area and likelihood of dystocia occurring in the event of changing maternal nutrient intake during gestation. This is an important finding given maternal diets high in protein and energy during the second trimester of gestation increased calf birth weight and calf birth weight was associated with an increase in the occurrence of dystocia in heifers calving as 3-year oldsThe influence of nutrition during the first and second trimesters of gestation on the occurrence of dystocia was investigated in 3-year-old composite-breed beef heifers. Heifers were allocated according to stratification by weight and genotype to either a high (H/- = 76 MJ metabolisable energy (ME) and 1.4 kg crude protein (CP)), or low (L/- = 62 MJ ME and 0.4 kg CP daily) nutritional treatment on the day of artificial insemination (day 0) to the same Senepol bull. Half of each nutritional group changed to an opposite nutritional group on day 93 of gestation (-/H = 82 MJ ME and 1.4 kg CP; -/L = 63 MJ ME and 0.4 kg CP daily), resulting in four treatment groups: HH (n = 16); HL (n = 19); LH (n = 17); LL (n = 19). From 180 days until calving all heifers were fed the same diets. Pelvic area measures were taken at heifer selection (-72 days) and at 117 days. Maternal circulating concentrations of estrone sulphate (ES), bovine placental lactogen (bPL), bovine pregnancy associated glycoprotein and progesterone were monitored throughout gestation. Heifers were observed continuously over the calving period and delivery type classified as being either eutocic or dystocic. The occurrence of dystocia was 14.1%. Increased calf birth weight increased the odds of occurrence of dystocia (odds ratio (OR) = 1.40; 95% confidence interval (95% CI) 1.12-1.76; P < 0.01). High diets in the second trimester were associated with heavier calves at birth (P = 0.01). The mean pelvic area of eutocic heifers on -72 d, tended to be greater compared to that of dystocic heifers (P = 0.08) such that a 1-cm2 difference in pelvic area tended to decrease the risk of dystocia (OR = 0.97; 95% CI 0.93-1.01; P = 0.09). Longer gestation length was associated with an increased risk of dystocia (P = 0.03). ES (P = 0.04) and bPL (P = 0.09) at calving were positively associated with the risk of dystocia. In conclusion, the current study demonstrates (a) that pelvic area measurement at selection in 3

KW - Beef

KW - Dystocia

KW - Heifers

KW - Peer reviewed

U2 - 10.1016/j.anireprosci.2009.08.006

DO - 10.1016/j.anireprosci.2009.08.006

M3 - Article

VL - 118

SP - 163

EP - 170

JO - Animal Reproduction Science

JF - Animal Reproduction Science

SN - 0378-4320

IS - 2-4

ER -