Influence of postpartum energy restriction on energy status, plasma LH and oestradiol secretion and follicular development in suckled beef cows

Grimard, Bénédicte; Humblot, P.; Ponter, Andrew; Mialot, J.P.; Sauvant, Daniel; Thibier, M.

doi:10.1530/jrf.0.1040173

Cited by 87 publications

(43 citation statements)

References 12 publications

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“…A taxa de parição média foi de 93% e a de desmame, de 83%, em relação ao número total de novilhas prenhes aos 13/15 meses de idade. Segundo Grimard et al (1995), mortalidade embrionária, aborto, perda perinatal de bezerros e debilidade da vaca no pós-parto ocorrem em maiores proporções em primíparas em relação a multíparas.…”

Section: Resultsunclassified

Desenvolvimento e desempenho reprodutivo de vacas primíparas aos 22/24 meses de idade

Pilau

Lobato

2009

R. Bras. Zootec.

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Reproductive performance of primiparous cows at 22/24 months of age ABSTRACT -The objective of this work was to evaluate the feed systems for 70 primiparous beef heifers from the initial gestation period at the age of 13/15 months to the end of the second reproductive period as primiparous cows at 22/24 months of age. The experimental design was fully random with plots subdivided in time considering animals as replicates.The initial mean live weigh was 282 kg and the initial mean body condition was 3.2. The feeding systems were proposed to obtain higher live weight gain at initial (PCIG) or final (PCFG) gestation period: PCIG -pregnant heifers on pearl millet pasture (Pennisetum americanum, L.) during the initial gestation period and on natural pasture at pre-calving period; PCFGpregnant heifers on natural pasture during the initial gestation period and on oat (Avena strigosa Schreb) and annual ryegrass (Lolium multiflorum Lam) pasture at pre-calving period. At initial gestation period, the mean live weight gain of 0.424 kg of PCIG heifers was higher than 0.245 kg of PCFG heifers. In the pre-calving period, PCIG heifers lost weight, 0.303 kg/day and presented BC of 0.77, while PCFG heifers gained 0.901 kg/day and presented BC of 0.37. The weight of 323 kg and body condition of 3.3 of post-calving PCFG heifers were higher than 274 kg and BC of 2.6 of PCIG heifers, respectively. PCFG heifers had calves 4 kg heavier. In the beginning of the second reproduction period, PCFG cows were 35 kg heavier and presented BC of 0.60. The pregnancy rate of 85% of PCFG heifers was higher than 53% of PCIG heifers.Pregnant cows had the highest body condition rate at calving and at the beginning of the second reproduction period, presented higher calving and mating interval and heavier calves.Key Words: body condition, dystocia, calving, live weight, grazing systems IntroduçãoO número de bezerros desmamados em relação ao número de fêmeas do rebanho é fator determinante, direto ou indireto, da rentabilidade na atividade pecuária do Brasil. Altos índices reprodutivos possibilitam ocupar áreas destinadas a vacas não-gestantes e novilhas em crescimento com categorias produtivas, basicamente R. Bras.

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Section: Resultsunclassified

Desenvolvimento e desempenho reprodutivo de vacas primíparas aos 22/24 meses de idade

Pilau

Lobato

2009

R. Bras. Zootec.

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“…Blood samples collected at the moment of follicular puncture were analysed by enzyme immunoassay for progesterone (Ovucheck plasma; Vétoquinol) and by radioimmunoassay for estradiol as previously described by Grimard et al (1995). Intra-assays coefficients of variation were 17.4% at 6.6 ng/ml and 6.7% at 60 pg/ml for progesterone and estradiol respectively.…”

Section: Assaysmentioning

confidence: 99%

Reduction of body-weight gain enhances in vitro embryo production in overfed superovulated dairy heifers

Fréret¹,

Grimard²,

Ponter³

et al. 2006

Reproduction

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The aim of our study was to test whether a reduction in dietary intake could improve in vitro embryo production in superovulated overfed dairy heifers. Cumulus-oocyte complexes of 16 Prim' Holstein heifers (14 6 1 months old) were collected by ovum pick-up (OPU), every 2 weeks following superovulation treatment with 250 mg FSH, before being matured and fertilized in vitro. Embryos were cultured in Synthetic Oviduct Fluid medium for 7 days. Heifers were fed with hay, soybean meal, barley, minerals and vitamins. From OPU 1 to 4 (period 1), all heifers received individually for 8 weeks a diet formulated for a 1000 g/day live-weight gain. From OPU 5 to 8 (period 2), the heifers were allocated to one of two diets (1000 or 600 g/day) for 8 weeks. Heifers' growth rates were monitored and plasma concentrations of metabolites, metabolic and reproductive hormones were measured each week. Mean live-weight gain observed during period 1 was 950 6 80 g/day (n 5 16). In period 2 it was 730 6 70 (n 5 8) and 1300 6 70 g/day (n 5 8) for restricted and overfed groups respectively. When comparing period 1 and period 2 within groups, significant differences were found. In the restricted group, a higher blastocyst rate, greater proportions of grade 1-3 and grade 1 embryos, associated with higher estradiol at OPU and lower glucose and b-hydroxybutyrate, were observed in period 2 compared with period 1. Moreover, after 6 weeks of dietary restriction (OPU 7), numbers of day 7 total embryos, blastocysts and grade 1-3 embryos had significantly increased. On the contrary, in the overfed group, we observed more <8 mm follicles 2 days before superovulation treatment, higher insulin and IGF-I and lower nonesterified fatty acids in period 2 compared with period 1 (no significant difference between periods for embryo production). After 6 weeks of 1300 g/day live-weight gain (OPU 7), embryo production began to decrease. Whatever the group, oocyte collection did not differ between period 1 and 2. These data suggest that following a period of overfeeding, a short-term dietary intake restriction (6 weeks in our study) may improve blastocyst production and embryo quality when they are low. However, nutritional recommendations aiming to optimize both follicular growth and embryonic development may be different.

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“…La influencia del nivel energético postparto sobre la duración del APP estuvo subordinada al efecto del nivel de alimentación recibido durante el último tercio de gestación, como también indicaron Wright et al (1992). El efecto de la nutrición postparto fue especialmente importante en animales jóvenes, tal y como han apuntado otros trabajos (Grimard et al, 1995). Sin embargo, este análisis evidenció que, en condiciones de alimentación y manejo del ternero adecuados, la duración del APP no supone una limitación importante de cara a obtener buenos resultados reproductivos en vacas primíparas.…”

Section: Discussionunclassified

“…De acuerdo con Grimard et al (1995), la variabilidad individual en la respuesta a la restricción alimenticia, a determinado manejo del ternero, a situaciones de estrés, etc., sería un factor a tener en cuenta para interpretar el porcentaje de inercia no explicada en el presente estudio.…”

Section: Discussionunclassified

Management factors associated to the duration of postpartum anoestrus interval in Brown Swiss and Pirenaica beef cows

Sanz

Bernués

Casasús

et al. 2003

Span. j. agric. res.

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IntroducciónLa obtención de un ternero por vaca y año es el objetivo productivo de las explotaciones de vacas nodrizas.Los prolongados periodos de inactividad sexual son uno de los mayores limitantes del rendimiento reproductivo para obtener una buena rentabilidad en la explotación.Los sistemas de producción en áreas de montaña están sujetos a grandes variaciones tanto en la producción como en la calidad de los recursos pastorales que utilizan, limitando en ocasiones la recuperación de pe- ResumenPara determinar los factores de explotación relacionados con la reactivación ovárica postparto en vacas nodrizas se realizó un análisis global de una serie de indicadores productivos y la duración del anestro postparto (APP) de 549 vacas explotadas en condiciones extensivas. Debido a la naturaleza multifactorial del proceso en estudio se eligió la metodología estadística multivariante (Análisis Factorial de Correspondencias Múltiples y Análisis Cluster). La duración del APP estuvo asociada a cuatro factores que explicaron el 59% de la heterogeneidad inicial de la muestra y que se definieron como: «Alimentación preparto» (19% de la inercia), «Alimentación postparto-Edad» (16.4%), «Manejo del ternero» (13%) y «Dificultad al parto» (10.5%). Estos factores se introdujeron en un Análisis Cluster que identificó cinco grupos de vacas con características productivas y reproductivas diferentes, y que denominamos como: «Primíparas», «Acceso restringido», «Acceso Libre-Parda de Montaña», «Parto de otoño» y «Parto de primavera». La raza no estuvo relacionada con la duración del APP, aunque el análisis Cluster asoció los largos APP inducidos por la crianza libre con la raza Parda de Montaña. En la raza Parda de Montaña, la duración del APP fue mayor en primavera que en otoño debido a diferencias nutricionales más que a un efecto estacional en sí. El parto de otoño se adaptó mejor a las condiciones de montaña seca.Palabras clave: vacas nodrizas, anestro postparto, factores de explotación, análisis multivariante. Abstract Management factors associated to the duration of postpartum anoestrus interval in Brown Swiss and Pirenaica beef cowsA global analysis of several productive indicators and the postpartum anoestrous interval (PPI) of 549 beef cows was carried out to determine the management factors related with postpartum ovarian reactivation in extensive mountain farming systems. Multivariate statistic methods (Multiple Correspondence Analysis and Cluster Analysis) were used to analyse the data due to the multifactorial nature of the processes involved. PPI was associated to four factors that explained 59% of the total inertia of the sample and were defined as follows: «Prepartum feeding level» (19% of the inertia), «Postpartum feeding level-Parity» (16.4%), «Suckling frequency» (13%) and «Calving difficulty» (10.5%). These factors were introduced into a Cluster Analysis that identified five types of cows: «Primiparous cows», «Twice-daily suckling», «Ad libitum suckling-Brown Swiss», «Autumn calving season» and «Spring calving seaso...

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Influence of postpartum energy restriction on energy status, plasma LH and oestradiol secretion and follicular development in suckled beef cows

Cited by 87 publications

References 12 publications

Desenvolvimento e desempenho reprodutivo de vacas primíparas aos 22/24 meses de idade

Desenvolvimento e desempenho reprodutivo de vacas primíparas aos 22/24 meses de idade

Reduction of body-weight gain enhances in vitro embryo production in overfed superovulated dairy heifers

Management factors associated to the duration of postpartum anoestrus interval in Brown Swiss and Pirenaica beef cows

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