Excretion rate of progesterone in milk and faeces
in lactating dairy cows with two levels of milk yield

Rabiee, A.R.; Macmillan, K.L.; Schwarzenberger, Franz

doi:10.1051/rnd:2001133

Cited by 20 publications

(3 citation statements)

References 36 publications

(49 reference statements)

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“…This may be due to the fact that, with exception of Cerri et al (2009) andCarvalho et al (2014) the other studies had used a CIDR contains 1.9g progesterone but in the current study the initial progesterone concentration was 1.38g. The other possible reason is the variation in progesterone metabolism among animals in different studies due to variation in species, breed, production rate, dry matter intake, lactation season and/or climatic conditions (Rabiee et al, 2001;Vasconcelos et al, 2003). Higher progesterone concentration at day three in comparison to the day one after insertion of new or reused CIDR indicates a slow increase in the serum progesterone concentration.…”

Section: Advances In Animal and Veterinary Sciencesmentioning

confidence: 99%

Efficiency of Previously used CIDR Stored for a Prolonged Period

Abdallah¹,

Elrahim²

2014

Adv. Anim. Vet. Sci.

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| This study investigated the efficiency of the previously used controlled internal drug release (CIDR) stored for 30 days before reusing. In the first experiment, twenty seven Holstein cows at the day of estrus (day 0) received either no treatment (control), new or reused CIDR and blood samples were collected at day 0, 1, 3 and 7. At day 1 and 3, serum progesterone concentration in cows received new CIDR (1.417 and 1.616 ng/ml) was significantly higher than in cows received a reused one (0.545 and 0.954 ng/ml) which in turn was higher than the control group. In the second experiment, estrous cycle was synchronized using Ovsynch, New-CIDRsynch or Reused-CIDRsynch. Cows in Ovsynch (n=119) received GnRH on day 0 then PGF2α on day 7. Fifty six hours after the PGF2α cows received another dose from GnRH and inseminated 18 h latter. Cows in new-CIDRsynch (n=870) and reused-CIDRsynch (n=220) were treated in the same way with exception of inserting a new or reused CIDR between day 0 and day 7. Non returned cows were examined for pregnancy diagnosis at 30 and 70 days post-insemination. Pregnancy-30 and 70 rates after New-CIDRsynch (36.1% and 30.5%) and Reused-CIDRsynch (36.4% and 31.8%) tended to be higher than after Ovsynch (27.7% and 25.2%) (P= 0.07: 0.08). In conclusion, the previously used CIDR -stored for 30 days-have residual progesterone and incorporating new or reused CIDR into Ovsynch improved the efficiency of the protocol in a similar way.

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Section: Advances In Animal and Veterinary Sciencesmentioning

confidence: 99%

Efficiency of Previously used CIDR Stored for a Prolonged Period

Abdallah¹,

Elrahim²

2014

Adv. Anim. Vet. Sci.

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“…Progesterone in blood is almost completely metabolised in a single pass through the liver [6]. Liver blood flow (LBF) and metabolic clearance rate (MCR) of P4 are elevated by increasing dry matter intake (DMI) in pigs [7], sheep [6], and dairy cattle [8,9]. Increased MCR of P4 reduces peripheral plasma P4 concentrations due to the inability of the corpus luteum to sufficiently increase its rate of P4 secretion to maintain homeostasis [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of grass dry matter intake and fat supplementation on progesterone metabolism in lactating dairy cows

et al. 2012

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39Progesterone (P4) metabolism in dairy cattle can be manipulated by alterations in dry 40 matter intake and diet composition. Our objectives were to determine the effects of 41 grazing allowance and fat supplementation on P4 metabolism in lactating dairy cows. 42Forty mid-to late-lactation Holstein-Friesian dairy cows were used in a completely 43 randomised block design, with a 2 x 2 factorial arrangement of treatments. Cows were 44 assigned to receive 1 of 2 pasture allowances [ad libitum allowance (AL -9.5 kg 45 DM/day) or restricted allowance (R -7 kg DM/day)] and 1 of 2 fat supplementation 46 treatments [750 g/day saturated fat (F) or no fat supplement (NF)]. All cows received 47 an additional 4 kg/d of concentrate. Grass dry matter intake (GDMI) was measured 5 48 wk after the initiation of dietary treatment. Cows were treated with prostaglandin F 2α 49 Revised 3 (PGF 2α ) to eliminate the endogenous source of P4, and 2 intravaginal progesterone 50 releasing devices (CIDR) were inserted into each cow for a period of 8 days. Regular 51 blood samples were taken prior to and following the removal of the CIDRs, and 52 analysed for P4 concentrations. The half-life (t½) and metabolic clearance rate (MCR) 53 of P4 was calculated for each cow. There was no effect of GDMI or fat 54 supplementation on the t½ or MCR of P4. There was a tendency for an interaction 55 between GDMI and fat supplementation on the t½ of P4; cows on the R-F diet tended 56 to have a longer P4 t½ than cows on the AL-F diet. It was concluded that greater 57 alterations in GDMI than achieved in the current study are required to change P4 58 metabolism. A combination of fat supplementation and restricted feeding slows P4 59 clearance, which may have beneficial implications for fertility. 60 KEYWORDS: Progesterone metabolism, dairy cattle, fat supplementation, dry 61 matter intake 62 63

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“…No ensaio de liberação in vivo de P 4 , em vacas de leite, obtiveram valores e tempos para a concentração máxima plasmática de P 4 (CIDR ® : 5,1ng/mL nas 14,4 horas e dispositivo de PCL: 5,3ng/mL nas 9,6 horas). Lembrando que os níveis de P 4 encontrados na circulação estão sujeitos à metabolização hepática e a meia vida da P 4 é ao redor de 22 a 36 minutos (SANGSRITAVONG, 2002), vacas de leite pelo maior fluxo sanguíneo, causado pela grande produção de leite, apresentam concentrações de P 4 mais baixas (RABIEE et al, 2001). Em estudo de Valentim (2004), utilizando animais da raça Nelore, o dispositivo DIB ® , atingiu a concentração máxima de P 4 de 4,5ng/mL (24 horas após sua inserção), entretanto, suas colheitas de sangue se iniciaram 24 horas após a inserção.…”

Section: Discussão 7 Discussãounclassified

Emprego de um novo dispositivo intravaginal para liberação de progesterona em programa de IATF em vacas Nelore (Bos taurus indicus)

Braga¹

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Dedico este trabalho, esta experiência e esta lição de vida aprendida durante estes anos: Aos meus pais Orlando e Silvana, sem os quais eu nunca conseguiria alcançar esta conquista e nenhuma das outras, pelo incentivo, conselhos e dedicação. Vocês me tornaram com eu sou no presente, passado de vocês e futuro para vocês. Aos meus avós José Alfredo, Giselda e Mafalda, pelo amor, gratidão, carinho e apoio incondicional em todos os momentos. Ao meu avô Leopoldo, pelo carisma e principalmente por sua alegria de viver. Você está presente comigo, muitas saudades... A minha tia Rita de Cássia, pela presença, ajuda e apoio em todas as circunstâncias desde tempos antigos. A minha namorada Jaqueline, pela sinceridade, amizade, carinho, amor e apoio em todas as situações alegres e algumas vezes tristes. Juntos, conseguiremos vencer muitas "pedras no caminho" desta vida. E também a sua família, obrigado por tudo. Ao restante de minha família, meu irmão Rafael, meus tios e tias, meus primos e primas, e também aos amigos que fiz ao longo de todos estes anos, pela amizade, ajuda, conselhos e participação.

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Excretion rate of progesterone in milk and faeces in lactating dairy cows with two levels of milk yield

Cited by 20 publications

References 36 publications

Efficiency of Previously used CIDR Stored for a Prolonged Period

Efficiency of Previously used CIDR Stored for a Prolonged Period

Effect of grass dry matter intake and fat supplementation on progesterone metabolism in lactating dairy cows

Emprego de um novo dispositivo intravaginal para liberação de progesterona em programa de IATF em vacas Nelore (Bos taurus indicus)

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