Função ovariana de novilhas Nelore alimentadas com dieta suplementada com gordura protegida ruminal

Guardieiro, M. M.; Bastos, M. R.; Mourão, Gerson Barreto; Carrijo, L. H. D.; Melo, E. O.; Rumpf, R.; Sartori, Roberto

doi:10.1590/s0100-204x2010000400009

Cited by 7 publications

(9 citation statements)

References 27 publications

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“…The size of the dominant follicle on the aspiration on day 8 of the cycle was affected by the treatment (P<0.05), showing a lower value in group 1.0 × M. The CL diameter on day 8 of the cycle did not differ between treatments (P>0.05), as observed by Guardieiro et al (2010).…”

Section: Resultsmentioning

confidence: 73%

Follicular dynamics and production of oocytes in young Nellore heifers with energetic supplementation

et al. 2012

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-To verify the effects of energy supplementation and fat on follicular dynamics, metabolic profile and the production of oocytes, 15 young heifers (Bos taurus indicus) with an average age of 14 months and with an initial weight of 256.35 kg were assigned to two treatments according to weight and follicular population as evaluated by ultrasonography: in T1 (1.0 × M), animals received 100% of the energy requirements for maintenance; in T2 (1.7 × M), animals received 170% of the energy requirements for maintenance, achieved by the addition of 200 g of Megalac ® . After a period of adaptation to the diet, the treatments, blood collection and follicular aspirations were started using a randomized design. The dry matter intake and weight gain were lower in the 1.0 × M group than in the 1.7 × M group. No differences were found in the plasma progesterone concentrations, albumin, glucose, urea or gonadotropin (FSH and LH) levels between the groups. The mean concentrations of cholesterol were higher in the 1.7 × M group. The total number of small (<4 mm) and medium follicles (4-8 mm) was not altered by the treatments, but the number of small follicles increased on days 1 and 2 of the estrous cycle, with higher values found in the 1.7 × M group. The average of the oocytes also increased (9.50±2.1 and 12.5±4.4 for the 1.0 × M and 1.7 × M groups, respectively). The rapid increase in the amount of energy offered in the diet changes the amount of follicles and oocytes available for follicular aspiration (OPU) in young heifers without changing their metabolic profile.

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Section: Resultsmentioning

confidence: 73%

Follicular dynamics and production of oocytes in young Nellore heifers with energetic supplementation

et al. 2012

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“…As suplementações com AGPs são utilizadas para aumentar o nível energético das dietas, além de apresentarem grande importância nos processos reprodutivos das fêmeas bovinas (Wathes et al, 2007). Não foi observado efeito das suplementações com fontes de gordura protegida (Megalac-E ® , rica em n-6) e não protegida (Linhaça, rica em n-3) nas variáveis estudadas para doadoras primíparas da raça Nelore ( Uma das potenciais razões para a ausência de efeito da suplementação com AGPs, no presente estudo, pode ter sido o fornecimento insuficiente desses ácidos graxos (100g de Megalac-E ® /doadora/ dia e 1,0 kg de torta de linhaça/doadora/dia; GuarDieiro et al, 2010), embora esta quantidade de Megalac-E ® seja sugerida pelo fabricante e utilizada em experimentos que obtiveram resultados positivos na reprodução (noGueira et al, 2012 (2006), doadoras da raça Holandesa aspiradas no pós-parto obtiveram melhora na taxa média de produção de blastocistos (32 dias = 5%; 85 dias = 20%) de acordo com os dias pós-parto. Resultado semelhante foi observado nesse estudo para doadoras primíparas da raça Nelore, no qual houve um aumento na taxa de oócitos cultivados recuperados nos dias 60 e 75 do pós-parto em comparação aos dias 30 e 45.…”

Section: Resultsunclassified

Efeito da suplementação com fontes de ácido graxos poliinsaturados em doadoras primíparas da raça Nelore durante o pré e pós-parto sobre número de oócitos obtidos in vivo e produção in vitro de embriões

Rossi¹,

Monteiro²,

Lima³

et al. 2015

Bol. Ind. Anim.

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O objetivo do trabalho foi avaliar os efeitos das suplementações ricas em ácidos linoleico (n-6) e linolênico (n-3) protegidos ou não, no pré e pós-parto de fêmeas primíparas da raça Nelore sobre número de folículos, número total de complexos cúmulos oócitos (CCO) aspirados (OPU) e de oócitos susceptíveis ao cultivo (graus I, II e III) e a produção in vitro de embriões (PIVE). As doadoras foram divididas aleatoriamente em 3 grupos: Controle (n=7), Megalac-E® (n=8; 100 g/doadora/dia) e Linhaça (n=7; 1,0 kg/doadora/dia). As dietas foram fornecidas pelo menos 30 dias pré-parto e 75 dias pós-parto. Estes animais foram submetidos à OPU nos dias 30, 45, 60 e 75 do pós-parto. Os oócitos recuperados foram selecionados e os considerados susceptíveis ao cultivo submetidos aos procedimentos da PIVE. Os dados foram analisados em um delineamento inteiramente casualisado com medidas repetidas no tempo. Não foi detectado efeito das suplementações no número de folículos, no número de CCO recuperados e susceptíveis ao cultivo e na PIVE. No entanto, houve um aumento na taxa de oócitos susceptíveis ao cultivo recuperado pela OPU nos dias 60 e 75 do pós-parto em comparação aos dias 30 e 45. Além disso, a taxa de embriões produzidos in vitro foi maior a partir do dia 45 pós-parto. Em conclusão, a suplementação pré e pós-parto com 100 g/dia de Megalac-E® ou 1,0 kg/dia de torta de linhaça não altera o número de oócitos obtidos in vivo e a PIVE de doadoras primíparas da raça Nelore lactantes. No entanto, a PIVE melhora quando os programas são realizados após 45 dias pós-parto.

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“…Feeding of supplemental fat increase propionic acid production and propionate:acetate ratio [5], resulting a higher efficiency of energy utilization, energy portioning and consequently a positive effect on DG. Although there is evidence that feeding fatty acids improve energy status of beef heifers, an enhanced reproductive performance may occur apart from energy balance [6]. Increased serum concentration of insulin, insulin growth factor-I (IGF-I) and Growth hormone (GH) were observed in response to PUFA supplementation in beef cows playing a role in follicular development [16].…”

Section: Discussionmentioning

confidence: 99%

“…Changes in follicular dynamics were affected by PUFA supplementation resulting potential alterations in ovarian sensivity to hormones such as IGF-I and gonadotrophins (FSH and LH) [13,17,20]. Thus, improvement in reproductive performance of beef heifers depends on stimulation of ovarian activity before FTAI program [6,8]. These finds can explain why Group1 heifers supplemented with PUFA before FTAI protocol presented larger diameter of ovulatory follicles and higher pregnancy rate when compared to Group 2 and Control.…”

Section: Discussionmentioning

confidence: 99%

Effects of Polyunsaturated Fatty Acids (PUFA) Supplementation on Reproductive Performance of Beef Heifers Submitted to Fixed-time Artificial Insemination (FTAI) Protocol

Borges

Gonsioroski

Silva

2019

Acta Scientiae. Vet.

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Background: More recently, polyunsaturated fatty acids (PUFA) supplements have been used in grazing beef herds in attempt to influence specific metabolic pathways and hormones that directly modulate reproductive function. Supplementation of calcium salts of PUFA can positively influence ovarian follicular growth, luteal function, and improve reproductive performance in dairy and beef females. The aim of this experiment was to evaluate strategies of dietary treatments using PUFA supplementation for 30 days before or after FTAI protocol and its effects on of ovulatory follicle size, ovulation, pregnancy and gestational losses rates in beef heifers. Materials, Methods & Results:One hundred and ninety-nine Brangus heifers (24 ± 3 months-old; BW= 320 ± 15 kg; BCS= 2.85 ± 0.17) were randomly assigned in three different groups to receive dietary treatments. Group 1 (n = 70) was fed with 0.5 kg/day of a protein-mineral mixture supplement containing 0.2 kg/day PUFA (Mix A) during 30 days before FTAI, Group 2 (n = 68) received the same supplement 30 days after FTAI and Control (n = 61) only the supplement without PUFA (Mix B) during all period. Heifers were submitted to estrous synchronization treatment using progesterone (P4), estradiol benzoate (E2) and prostaglandin F 2α (PGF). Ultrasound exams were done to measure ovulatory follicle diameter and to determinate ovulation and pregnancy rates on Days 30 and 60 after FTAI. Daily gain (DG) was higher (P < 0.05) only when heifers received supplement containing PUFA (Group 1= 30 days prior FTAI) and (Group 2= 30 days after FTAI). PUFA supplementation before FTAI also resulted in larger ovulatory follicles diameter (P < 0.05) in Group 1 (11.2 ± 2.5 mm) compared to Group 2 (9.9 ± 2.3 mm) and Control (10.0 ± 2.07 mm). Ovulation rates were similar (P > 0.05) in Group 1 (90%), Group 2 (75%) and Control (67%). Pregnancy rates were higher (P < 0.05) in Group 1 (Day 30= 67.1% and Day 60= 64.2%) when compared with Group 2 (Day 30= 48.5% and Day 60= 44.1%) and Control (Day 30= 49.2% and Day 60= 45.9%). Gestation losses were similar (P > 0.05) among Groups 1 (6.6%), 2 (9%) and Control (6.6%). Discussion: Rumen-protected supplemental lipids have been used to increase energy density and to determine direct positive effects on reproduction in dairy and beef herds. There is evidence that feeding moderate amounts of PUFA supplements can improve energy status and result in significant differences in DG as it was observed during experimental period. Thus, heifers that received 0.2 kg/day of PUFA supplement 30 days before FTAI protocol had also a positive effect on ovulatory follicles size, but ovulation rates were similar in groups. Beneficial effects of pre-breeding PUFA supplementation were observed on pregnancy rates on Days 30 and 60 after FTAI, but pregnancy loss was not different among dietary treatments in beef heifers. Based on this study, PUFA supplementation before FTAI protocol had a positive effect on reproductive performance of beef heifers by directly improving ovarian function, ...

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Função ovariana de novilhas Nelore alimentadas com dieta suplementada com gordura protegida ruminal

Cited by 7 publications

References 27 publications

Follicular dynamics and production of oocytes in young Nellore heifers with energetic supplementation

Follicular dynamics and production of oocytes in young Nellore heifers with energetic supplementation

Efeito da suplementação com fontes de ácido graxos poliinsaturados em doadoras primíparas da raça Nelore durante o pré e pós-parto sobre número de oócitos obtidos in vivo e produção in vitro de embriões

Effects of Polyunsaturated Fatty Acids (PUFA) Supplementation on Reproductive Performance of Beef Heifers Submitted to Fixed-time Artificial Insemination (FTAI) Protocol

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