Searchable abstracts of presentations at key conferences on reproductive biology and medicine

ra0003p053 | (1) | SRF2016

The effect of dietary protein level on bovine follicular dynamics in beef heifers

Edwards Jennifer , Mongan Nigel , Rutland Catrin , Perry Viv , Robinson Robert

Introduction: Periconception dietary protein can affect fertility in cattle. This study investigated the effect of dietary crude protein intervention on gene expression in granulosa cells, metabolite concentrations in follicular fluid and serum anti-Müllerian hormone (AMH) concentrations.Methods: Non-pregnant Angus cross heifers (n=320) were group fed an isocalorific low (LP 10%) or high (HP 14%) crude protein diet for >60 days prior to...

ra0002o021 | Oral Communications 3: Sperm | SRF2015

Ruminal acidosis has long-term effects upon sperm production in the bull

Callaghan Matthew , Hernandez-Medrano Juan H , McAuliffe Peter , Perry Viv E A

Seedstock bulls in Australia are commonly fed high-energy supplements prior to sale. These supplements contain readily fermentable carbohydrates, which may precipitate ruminal acidosis. We hypothesise that a single transient acidotic SARA event would decrease semen production sufficient to preclude bulls from BBSE thresholds and thereby sale.Santa Gertrudis bulls (n=10, age 20±6 months) were fed in yards on ad lib hay with daily in...

ra0002p036 | (1) | SRF2015

Effects of maternal peri-conception and first trimester protein supplementation on circulating progesterone levels and concomitant conception rates in yearling heifers

Copping Katrina J , Callaghan Matthew , McMillen Caroline , Rodgers1 Ray , Perry Viv E A

Introduction: This study investigates the effect of dietary crude protein on conception in range beef heifers and uses circulating progesterone as a measure of early embryonic loss known to be a major cause of reproductive inefficiency.Methods: Primaparous 14 month old Bos indicus cross heifers (n=350) were selected from a range population. 60 days prior to artificial insemination they were randomly assigned to two equal groups and indi...

ra0002p040 | (1) | SRF2015

Sex specific effects of maternal dietary protein during the periconceptional period upon hepatic gene expression in heifer progeny

Morrison Janna , Copping Katrina J , Hernandez-Medrano Juan H , Rodgers Raymond , McMillen Caroline , Perry Viv E A

Sex specific expression occurs in 20–30% of all hepatic genes in the adult animal (1). We have shown that there is an interaction between gender and the level of maternal dietary protein intake on bovine fetal development as early as 36–39 days post conception (dpc) We hypothesise that exposure to different levels of maternal protein intake in the periconceptional period (60d preconception to 23dpc) and in the postconceptional period (23–98dpc) will result in a ...

ra0001p290 | (1) | WCRB2014

Sex specific effects of maternal dietary protein upon uterine blood flow and fetal growth

Hernandez-Medrano Juan H , Copping Katrina J , Hoare A S , Wapenaar Wendela , Grivell Rosalie , Callaghan Matthew , McMillen Caroline , Rodgers Ray , Perry Viv E A

Introduction: Neonatal and fetal mortality is increased in male fetuses. Evidence is emerging of sex specific differences in fetal and placental perfusion1. This study investigates effects of dietary intervention at specific time points upon blood flow and fetal growth trajectory in cattle.Materials and methods: Primiparous heifers were either individually- (Australia, Au; n=360) or group-fed (UK; n=188) diets containing diff...

ra0001p357 | (1) | WCRB2014

Effects of maternal peri-conception and first trimester protein supplementation on placental development

Edwards Jennifer L , Copping Katrina J , Alibhai Aziza , Graham Holly , Barnett Stephanie , Robinson Robert S , Perry Viv E A , Mongan Nigel P , Rutland Catrin Sian

Introduction: This study investigates the effect of dietary crude protein on the cellular composition of the 98 days bovine placenta.Materials and methods: Primiparous 14-month-old Bos. indicus cross heifers in Australia (n=350) were individually fed isocalorific high (H; 14%) or low (L; 7%) CP from day −60 prior to conception to 23 days post conception (dpc). At 23 days post-conception the two groups were further split into high ...