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Interactions between environmental temperature and porcine growth hormone (pGH) treatment in neonatal pigs.

Abstract：

:Age-dependent interactions between environmental temperature and porcine growth hormone (pGH) treatment on the function of the somatotrophic axis were evaluated in the neonatal pig. At 3 d of age, 40 Landrace x Yorkshire x Duroc piglets received intraperitoneal implants containing either recombinant pGH (0.5 mg/d; n = 20) or vehicle (control; n = 20). Piglets were maintained at either a low (21 degrees C, 50% relative humidity; n = 20) or high (32 degrees C, 50% relative humidity; n = 20) temperature. At 4 and 6 wk of age, 5 pGH-treated and 5 control piglets from each thermal group were sacrificed for tissue collection. Blood samples were collected at the time of sacrifice and analyzed for serum concentrations of GH, insulin-like growth factor 1 (IGF-1), and IGF-2. Liver RNA was analyzed for mRNAs specific for the GH receptor, IGF-1, IGF-2, and IGF binding protein 3. There was no effect of pGH treatment (P = 0.4) on average daily gain; however, both age (P = 0.002) and temperature (P = 0.001) had an effect on average daily gain such that those animals maintained at a low temperature and those sacrificed at 6 wk had greater average daily gains. Serum concentration of GH was elevated (P = 0.003) by pGH treatment and was lowest in the 6-wk-old group (P = 0.008). Serum concentration of IGF-1 was elevated (P = 0.007) by pGH treatment and increased with age (P = 0.01). Liver GH receptor mRNA was unaffected (P > 0.5) by pGH treatment, but was greater in the 6-wk-old group (P < 0.0001) and in piglets maintained at the high temperature (P = 0.04). IGF-1 mRNA was enhanced by pGH treatment (P = 0.0003) and by exposure to the high temperature (P = 0.04), but did not differ (P > 0.5) between age groups. IGF-2 mRNA was greater (P = 0.0009) in the 4-wk-old group and in piglets maintained at the high temperature (P = 0.007), but was unaffected (P = 0.5) by pGH treatment. IGF binding protein 3 mRNA increased with age (P = 0.0004) and was stimulated by pGH treatment in the 6-wk-old group (P = 0.034). The relatively lower level of GH receptor and IGF mRNAs in conjunction with greater growth in the cold environment suggests that somatotrophic gene expression in the liver is not rate limiting for growth in the neonatal pig.

journal_name

Domest Anim Endocrinol

journal_title

Domestic animal endocrinology

authors

Carroll JA,Buonomo FC,Becker BA,Matteri RL

doi

10.1016/s0739-7240(99)00003-x

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

103-13

issue

2

eissn

0739-7240

issn

1879-0054

pii

S073972409900003X

journal_volume

16

pub_type

杂志文章

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