Plasma hormones, blood metabolites, milk yield and composition in early lactation of buffaloes treated with bromocryptine

Șara, Aurel; Singh, Manvendra

doi:10.5713/ajas.1998.368

Cited by 2 publications

(5 citation statements)

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“…Plasma prolactin, growth hormone (GH) and cortisol were measured using Radioimmunoassay methods (Saha and Singh, 1998;Singh and Ludri, 1999). The iodination of prolactin and growth hormone (10 ug) was done using 10 ul (2.0 mCi) carrier free iodine Na I 125 in a reaction vial.…”

Section: Hormone Assaysmentioning

confidence: 99%

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Milk Production, Blood Metabolites and Circulatory Levels of Hormones in Crossbred Goats

Singh¹,

Ludri²

2002

Asian Australas. J. Anim. Sci

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Collection and analysis of milk and blood samplesAt fortnightly intervals (periods), milk samples were collected from individual goat throughout the experimental period of 150 days duration. Aliquots of milk in proportion to yield from each milking of individual goat were composited for analysis of milk constituents. In milk samples, fat was determined volumetrically by Gerber's method (I.S.I. 1958), protein by the method of Singhal and Des Raj (1989) and lactose by picric acid method (Perry and Doon, 1950). At 8:00 AM, jugular blood samples were collected in heparinized vacutainer tubes at fortnightly intervals from each goat. The blood samples were centrifuged and plasma was stored frozen in a freezer (-21°C) till analysis. For glucose estimation blood samples were collected in the tubes containing sodium fluoride and were immediately transferred into ice bucket. Blood glucose was estimated by Nelson-Somogyi method as described by

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Section: Hormone Assaysmentioning

confidence: 99%

“…89 F-4801, Sigma. USA) as described by Saha and Singh (1998). Thyroxine (T 4 ), tri-iodothyronine (T 3 ) and insulin were estimated by Radioimmunoassay kits supplied by Board of Radiation and Isotope Technology, Mumbai, India.…”

Section: Hormone Assaysmentioning

confidence: 99%

Milk Production, Blood Metabolites and Circulatory Levels of Hormones in Crossbred Goats

Singh¹,

Ludri²

2002

Asian Australas. J. Anim. Sci

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“…The comparable information on this aspect is lacking. Administration of bromocryptine during established lactation did not influence milk yield and composition in buffaloes (Saha and Singh, 1998) but treatment decreased milk yield and alter milk composition in goats (Singh and Ludri, 1999). The increase in protein content in experimental buffaloes was due to initial higher protein values in comparison to control.…”

Section: Discussionmentioning

confidence: 76%

“…In rats, suppression of secretion of PRL with bromocryptine suppressed secretion of milk; conversely, administration of PRL increased the secretion of milk in rats during early lactation. But in cattle and buffaloes PRL suppression did not limit the secretion of milk and supplemental PRL has no effect on milk yield (Saha and Singh, 1998). Furthermore, bromocryptine and cold temperatures markedly reduce the secretion of PRL without suppressing the milk yield in cows (Pal, 1996).…”

Section: Discussionmentioning

confidence: 99%

“…A single injection of bromocryptine is effective to lower the PRL level for a number of days in cattle and buffaloes, but in goat its effect is short-term and daily administration of bromocryptine is required (Hart, 1973;Lee and Forsyth, 1987;Singh and Ludri, 1999). Bromocryptine administration during established lactation significantly decreases the plasma PRL level without affecting the milk production and composition because of the saturation of receptors at low-PRL concentration (Saha and Singh, 1998). PRL does not act in isolation and interact with GH and thus an interaction of both the hormone is important in milk secretion (Flint and Knight, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Bromocryptine on hormones and milk secretion in Murrah buffaloes (Bubalus bubalis)

Prasad

Singh

2010

Animal

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An experiment was carried out on 10 advance pregnant Murrah buffaloes to determine the role of hormones in milk secretion around parturition. Experimental animals were administered with a single injection of bromocryptine, @ 100 mg/kg BW, for 5 days before expected calving, whereas control group buffaloes were injected with placebo injections. Blood samples collected before parturition (25,24,23,22,21 days), on day of parturition (day-0) and on day 1, 2, 3, 4, 5, 10 and 15 post partum were analyzed for growth hormone (GH), insulin like growth factor-I (IGF-I) and prolactin (PRL) by radioimmunassay methods. Milk samples were collected daily for 5 days and on day 10 and 15 after parturition. Milk fat, protein, lactose, citric acid, non-esterified fatty acids (NEFAs) and somatic cell counts (SCCs) were determined in milk samples. Bromocryptine treatment significantly ( P , 0.01) decreased pre partum PRL and increased GH levels ( P , 0.01) on day of parturition in experimental buffaloes without influencing plasma IGF-I level. Milk yield was significantly lower ( P , 0.01) in experimental than in control group. Further, effect of bromocryptine on milk yield was only for a week. Milk yield increased ( P , 0.01) gradually and was similar to control group on day 15 post partum. Bromocryptine treatment significantly increased milk SCC ( P , 0.01) and protein content ( P , 0.01) but there was no effect of treatment on fat, lactose, citric acid, glucose, milk and plasma NEFA concentration. It was concluded that prepartum suppression of PRL by bromocryptine impairs milk secretion temporarily in ensuing lactation. The significant rise in GH level before parturition and on day of parturition suggests a role of it in milk secretion of buffaloes.

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Plasma hormones, blood metabolites, milk yield and composition in early lactation of buffaloes treated with bromocryptine

Cited by 2 publications

References 0 publications

Milk Production, Blood Metabolites and Circulatory Levels of Hormones in Crossbred Goats

Milk Production, Blood Metabolites and Circulatory Levels of Hormones in Crossbred Goats

Effect of Bromocryptine on hormones and milk secretion in Murrah buffaloes (Bubalus bubalis)

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