Influence of different planes of energy supply prior to the breeding season on blood metabolites in female mink (Mustela vison)

Fink, Rikke; Tauson, Anne‐Helene; Forsberg, M.

doi:10.1051/rnd:19980109

Cited by 12 publications

(12 citation statements)

References 14 publications

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“…Period effects were significant for thyroid hormones and IGF-1 and with insulin there was only a tendency for them; concentrations decreased during restriction and increased during refeeding. These results were in good agreement with [17,18].…”

Section: Discussionsupporting

confidence: 88%

“…Moreover, limited data have indicated that flush feeding may result in a more synchronised LH release and in more distinct peaks [42], but here, sampling frequency was too limited to allow for an un-ambiguous description of the LH release pattern. Also metabolic traits such as plasma concentrations of insulin and thyroid hormones [17] as well as IGF-1 [18] have been shown to be affected by energy supply prior to the breeding season, but the response has not been related to reproductive endocrinology.…”

Section: Introductionmentioning

confidence: 99%

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LH release in mink (Mustela vison). Pattern of the LH surge and effect of metabolic status

Tauson¹,

Fink²,

Forsberg

et al. 2000

Reprod. Nutr. Dev.

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-The mink is a seasonal breeder with induced ovulation and delayed implantation. Reproductive processes are strongly influenced by energy supply and body condition. Items for which there is paucity or complete lack of data were the main objectives of this study: the temporal relationship between copulation and the pre-ovulatory LH surge and the influence of energy supply on LH release. A total of 30 yearling female mink with a well defined metabolic status was used. Twelve females kept in the laboratory were measured in six consecutive one-week balance periods each including the measurement of heat production by means of indirect calorimetry, and 18 females were kept under conventional farm conditions. The animals were fed so as to maintain energy balance (CON), flush fed by 2 weeks food restriction followed by 2 weeks refeeding (FLUSH), or kept in a negative energy balance (NEG). Plasma concentrations of the thyroid hormones, IGF-1 and insulin were determined weekly (n = 12), or 1 week after change in energy supply to the FLUSH group (n = 18). On the day of mating, blood samples for LH and oestradiol-17β (E 2 ) were taken before and immediately after mating and then 4, 8, 12, 24, 30 and 48 h thereafter. Frequent blood samplings, each lasting 60 min, were taken during the LH surge from two other females surgically fitted with venous access ports. Peak concentrations of LH were recorded on the first sampling, an average 16 min after mating. The concentrations remained elevated for 12 h, but almost decreased to basal values 24 h after mating. Plasma E 2 was high before mating and peak values were attained 4 h after mating after which it decreased. Energy supply had no significant influence on LH and E 2 , but there was a tendency for a more sluggish LH release in NEG animals. The lack of response in FLUSH animals was explained by these animals having a lower intake of metabolisable energy than CON animals, the total intake not being significantly different from the NEG group. Plasma concentrations of thyroid Reprod. Nutr. Dev. 40 (2000) 229-247 229

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

LH release in mink (Mustela vison). Pattern of the LH surge and effect of metabolic status

Tauson¹,

Fink²,

Forsberg

et al. 2000

Reprod. Nutr. Dev.

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“…We have previously shown that insulin changes rapidly in mink in response to changes in energy supply (Fink et al 1998;Tauson et al 2000), which was confirmed here and fits the concept of insulin as regulator of energy-supply-induced changes in leptin secretion (Havel, 2000). However, food restriction may cause an increased sympathetic activity to the white adipose tissue (Migliorini et al 1997), and this regulation mediated via catecholamines and b-agonists seems to be more pronounced than other regulatory factors , so it cannot be excluded that this mechanism was the main cause of the decrease in plasma leptin during food restriction.…”

Section: Discussionmentioning

confidence: 99%

“…Plasma concentrations of insulin were determined by radioimmunoassay (Pharmacia insulin radioimmunoassay; Kabi-Pharmacia, Uppsala, Sweden) previously validated for mink plasma (Fink et al 1998). The within-assay CV estimated from the precision profile was , 15 % for concentrations between 3 and 240 mU/ml.…”

Section: Methodsmentioning

confidence: 99%

Body-weight changes are clearly reflected in plasma concentrations of leptin in female mink (Mustela vison)

Tauson¹,

Forsberg

2002

Br J Nutr

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The mink is a seasonal breeder with a propensity for seasonal fatness, and it is very responsive to changes in energy supply. The objectives of the present study were first, to validate a multispecies leptin assay for mink (Mustela vison) plasma, and second, to evaluate how plasma leptin and insulin concentrations responded to energy restriction and body-weight loss and refeeding with restoration of body reserves. The study was performed with six very fat yearling females (initial mean body weight 1451 (SD 119) g, i.e. approximately 300 g more than for a female in normal body condition). The animals were fed in restricted amounts (about 35 % metabolizable energy requirement for maintenance) in order to reach a very lean body condition. The target weight of 800 g was reached after about 1 month of restriction. The animals were then refed ad libitum until almost complete weight recovery. Blood samples were taken on days 1, 24, 34 (end of restriction), 44, 55 and 71 (end of experiment) and analysed for plasma concentrations of leptin and insulin. Three females were mated on day 44. Leptin and insulin concentrations mirrored each other and clearly reflected changes in body weight. Significant ðP,0·001Þ Pearson correlation coefficients of 0·75 (leptin -insulin), 0·72 (leptin -body weight) and 0·59 (insulinbody weight) were found. Two of the three females that were mated gave birth to normal litters. It was concluded that the leptin assay yielded acceptable results for animals with body weight:fat content within the range investigated here, and that plasma leptin reflected body fat mass.

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“…De esta forma, dietas altas en fibra aumentan la producción lechera (Nizza et al, 1997;Pascual et al, 2002) y disminuyen la movilización de grasas en la hembra (Xiccato et al, 1999), sin afectar al intervalo entre partos ni a la vida útil de la hembra (Pascual et al, 2002). Dado que en otras especies, aumentar la energía obtenida con la dieta algunos días antes del coito da buen resultado (Ebling y Foster, 1991;Fink et al, 1998;Khireddine et al, 1998), se han realizado algunos estudios para comprobar si este efecto positivo ocurría también en conejos, sin obtener resultados concluyentes. Mientras que el aumento de energía en la dieta 10 días antes del coito en hembras multíparas lactantes aumentó su fertilidad (Fortun-Lamothe, 1998), si este aumento se realizaba cuatro días antes, no se observaba ningún efecto (Maertens, 1998).…”

Section: )unclassified

Estudio de los factores materno-embrionario que determinan la fertilidad y prolificidad en una línea de conejo seleccionada por velocidad de crecimiento

Bordes¹,

Dolores²

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JJ. Rosseau AgradecimientosEs tanto lo que tengo que agradecer y a tantas personas, que no sé muy bien por dónde empezar, así que un millón de gracias a todos los que me han ayudado con mucho o poco tiempo, estén o no aquí.Por supuesto, mil gracias a mis directores, Paco y José. A José, por enseñarme tanto en todos los aspectos y a Paco, por el apoyo y los empujones. A la Rachel, por ser mi compi de tantas y tantas cosas, y por intentar hacerme más fácil eso de la genética cuantitativa. Ánimo, que ya falta poco para la tuya, aunque como siempre te digo, lo tienes chupado. A Pilar y toda su tropa, por darle color al laboratorio, y, cómo no, a las "Supernenas", Mara, Carmen y Estrellita, por alegrar los últimos momentos (lo sé, lo sé, tenemos una pendiente). También me gustaría agradecer a todo el personal del departamento de Ciencia Animal el tiempo dedicado pero, en especial, a Noelia por el apoyo de todo tipo en muchos momentos y a Luis García, por el tiempo dedicado. Ah! Y, por supuesto, a Fede por sus paellas. Al Dr. Manuel Baselga, por financiar todo esto y al Dr. Agustín Blasco, por hacer que la estadística sea algo más sencillo. A mis compis de máster, pero en especial, a les "valencianetes del nord", la Marins y la Lliber, aunque sabes que eres mucho más que una compi de máster. Espero que todo te vaya bien en la ´América profunda´, nos vemos a la vuelta. No puedo olvidarme de mis "Haleños", Gemma, Ceci, Antonio y Laura, que me hicieron sentirme como en casa durante mi estancia en tierras teutonas. Estos agradecimientos no estarían completos si no les diera las gracias a Ángel y a Antonio, por darme mi primera oportunidad, por meterme en el cuerpo el gusanillo de la investigación y por otras muchas cosas. De corazón, mil gracias.Muchas son las personas que a lo largo de estos años me han apoyado de muy diferentes formas, así que intentaré no olvidarme de nadie. A Amparo y Milio, a Raúl y a Rafa, por todos estos años, no sé cómo agradeceros todo el apoyo en los buenos y en los malos momentos. Sabéis que me tendréis siempre a vuestro lado. En primer lugar, a los recién estrenados papis: Amparito, gracias por estar ahí siempre, no sé cómo podría agradecerte tantos años de apoyo y alegrías, por ayudarme a tener los pies en el suelo pero sobre todo, por ser una de las personas más honestas que conozco. Me alegro de que estés en mi vida y espero que siempre sea así. A Milio, por tantos buenos ratos, no te preocupes, pase lo que pase, seguiré riéndome de tus coñas, aunque sea la única. Nora, cuando seas mayor, estarás muy orgullosa de tus papis, estoy segura. A Raúl, porque sé que siempre estarás ahí pase lo que pase como todos estos años. Sabes que es recíproco. Y, por supuesto, a mi Rafita, por todo lo que hemos compartido a lo largo de muchos años, por tantos buenos ratos, por hacerme reír siempre con las cosas más absurdas, por enseñarme a respetar cualquier idea y por darme una visión de la vida tan particular y tan tuya, mil gracias. Sabes que siempre me tendrás a tu lado (siempre y cuando haya café de por...

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Influence of different planes of energy supply prior to the breeding season on blood metabolites in female mink (Mustela vison)

Abstract: -Metabolic blood profiles were studied in a total of 30 female mink (Mustela vison) at different planes of nutrition prior to the breeding season in a control (CON; n = 10), a flushed (FLUSH; n = 10) and a negative energy balance group (NEG; n = 10). The

Cited by 12 publications

References 14 publications

LH release in mink (Mustela vison). Pattern of the LH surge and effect of metabolic status

LH release in mink (Mustela vison). Pattern of the LH surge and effect of metabolic status

Body-weight changes are clearly reflected in plasma concentrations of leptin in female mink (Mustela vison)

Estudio de los factores materno-embrionario que determinan la fertilidad y prolificidad en una línea de conejo seleccionada por velocidad de crecimiento

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