【摘 要】
：
[Background]Selenium (Se)is an essential nutrient for the chicken.We recently reported that both insufficient and excess Se decreased growth in chickens.Oral Se administration to Se-deficient chickens
【机 构】
：
College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030,P.R.China
【出 处】
：
中国畜牧兽医学会兽医内科与临床诊疗学分会第八届代表大会暨学术研讨会
论文部分内容阅读
[Background]Selenium (Se)is an essential nutrient for the chicken.We recently reported that both insufficient and excess Se decreased growth in chickens.Oral Se administration to Se-deficient chickens has been reported to increase appetite within hours.[Objective]To better understand the relationship of Se status with growth and appetite.[Methods] 1-day-old Hy-Line White chickens were fed 4 levels dietary Se (0.028 to 5.0 mg Se/kg)as Na2SeO3 for 8 wk.[Results]Body weight(BW) and feed intake(FI) were decreased significantly by Se-low (Se-L,0.028 mg/kg) and Se-excess (Se-E ,5.0 mg/kg) vs.Se-adequate (Se-A ,0.15 mg/kg),whereas Se-supernutrition (Se-S,3.0 mg/kg) increased BW and FI as compared to Se-A birds.FI relative to metabolic size (FI/BW0.67) of Se-S birds was significantly higher than other groups.Se-S lowered and Se-E increased blood glucose relative to Se-A and Se-L birds.At 8 wk, gene expression of Neuropeptide Y (NPY)in hypothalamus was increased by Se-S but leptin receptor (LEPR)mRNA levels were unchanged relative to Se-A birds,suggesting that increased FI in Se-S birds was due to increased appetite.In Se-E birds,LEPR mRNA levels were increased at 8 wk,suggesting appetite was decreased in Se-E birds.There were no differences in NPY or LEPR mRNA in Se-L vs.Se-A birds.[Conclusion]In summary,these results demonstrate that changes in growth and feed efficiency with supernutritional Se and excess Se are associated with changes in appetite.
其他文献
Introduction The distances seeds disperse are exceedingly difficult to quantify, yet critical for understanding plant dynamics.Resolving the relationships between easily measured plant traits and more
Introduction Whipgrass (Hemarthria compressa (L.f.) R.Br.), a stoloniferous perennial tropical grass belonging to the tribe Andropogoneae, has several outstanding characteristics that make it attracti
Introduction Zelkova abelicea (Lam.) Boiss.is an alpine Tertiary relict species, the only endemic tree in the Cretan flora.The dispersal units are short annual shoots bearing dry leaves and a few one-
Introduction Evergreen broad-leaved forests play a great role in biodiversity conservation and sustainable development in subtropical China (Ding et al 2004).However, currently they are threatened by
Introduction The Chinese Loess Plateau is subjected to severe soil erosion and degradation, where natural revegetation is proved the basis and effective approach for vegetation restoration (Jiao et al
Introduction In the hill-gully Loess Plateau region, extensive soil erosion frequently occurs on sloped lands, threatening both ecosystems and social economics.Vegetation can improve the ecosystem and
Introduction The reproductive ecology of plant species is closely linked to extinction of many species.The studies on reproductive ecology of endangered species include four aspects: pollination ecolo
Introduction Hemarthria compressa is one of five major forage grasses in Southwest China.For its low sexual reproduction, it is propagated by stolons, rhizomes and nodal sections.The use of biotechnol
Forty dairy cows with left displacement of abomasum were ultrasonographically examined to determine the position and the echogenic property of abomasum.In clinically, the existence of high-pitch ping
Fatty liver is a major metabolic disorder that occurs during early lactation in high-producing dairy cows.Sterol regulatory element-binding protein-1c (SREBP-1c) is an important transcription factor t