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| 1 | Mammary gland growth and vascularity at parturition and during lactation in primiparous ewes fed differing levels of selenium and nutritional plane during gestation显示文摘Background: Objectives were to examine the effects of selenium(Se) supply and maternal nutritional plane during gestation on mammary gland growth, cellular proliferation, and vascularity at parturition and d 20 of lactation. Rambouillet primiparous ewes(n = 84) were allocated to treatments in a 2 x 3 factorial. Factors were dietary Se(adequate Se [ASe, 11.5 μg/kg BW] or high Se [HSe, 77.0 μg/kg BW]) and nutritional plane(60% [RES], 100% [CON], or 140% [EXC]). At parturition, lambs were removed and 42 ewes(7/treatment) were necropsied. Remaining ewes were fed a common diet meeting requirements for lactation and mechanically milked twice daily until necropsy on d 20. At both necropsy periods, mammary glands were dissected and tissues harvested. Samples were analyzed for RNA, DNA, and protein content, cell proliferation, and vascularity. Where interactions were present(P ≤ 0.05), least squares means from the highest-order interaction are presented. Results: Final body weight of ewes was least(P ≤ 0.002) in RES, intermediate for CON, and greatest for EXC, regardless of stage of the ewe at necropsy(parturition or d 20 of lactation). In ewes necropsied at parturition, mammary glands were heavier(P = 0.02) in EXC compared to RES, with CON intermediate. Concentration of RNA(mg/g) was decreased(P = 0.01) in EXC compared to CON at parturition. There was a tendency(P = 0.07) for a Se by nutrition interaction in percentage of cells proliferating where ASe-EXC ewes had greater(P ≤ 0.02) number of proliferating cells then all other treatments. Mammary vascular area tended(P = 0.08) to be affected by a Se by nutrition interaction where ASe-CON had less(P = 0.007) vascular area than HSe-CON ewes. In ewes necropsied at d 20 of lactation, the number of alveoli per area was decreased(P ≤ 0.05) in RES compared to CON and EXC-fed ewes. Conclusions: Results of this study indicate that proper maternal nutritional plane during gestation is important for mammary gland development, even out to d 20 of lactation. | Tammi L Neville Allison M Meyer Arshi Reyaz Pawel B Borowicz Dale A Redmer Lawrence P Reynolds Joel S Caton Kimberly A Vonnahme | 2013 | Journal of Animal Science and Biotechnology2013，4，4： | 3 |
| 2 | Angiogenesis in the corpus luteum显示文摘 | Reynolds LP Grazul-Bilska AT Redmer DA | 2000 | Endocrine2000，12，1： | 1 |
| 3 | First-order liquid-liquid phase transition in dense hydrogen显示文摘 | Lorenzen W Holst B Redmer R | 2010 | Phys Rev B2010，82，19： | 1 |
| 4 | Angiogenesis in the female reproductive organs:Pathological implications显示文摘 | Borowicz PP Redmer DA | 2002 | Int J Exp Pathol2002，83，4： | 1 |
| 5 | Angiogenesis in the placenta显示文摘 | Reynolds LP Redmer DA | 2001 | Biol Reprod2001，64，： | 1 |
| 6 | Expression of gap junctional proteins cormexin 43,32, and 26 throughout follicular development and atresia in cows 显示文摘 | Johnson ML Redmer DA Reynolds LP | 1999 | Endocrine1999，10，1： | 1 |
| 7 | Influence of undegraded intake protein on retake,digestion,serum hormones and metabolites,and nitrogen balance in sheep显示文摘 | Swanson K C Catun J S Redmer D A | 2000 | Small Ruminant Reserch2000，35，： | 1 |
| 8 | Gap junctional proteins,connexin 26,32, and 43 in sheep ovaries throughout the estrous cycle显示文摘 | Grazul-Bilska AT Redmer DA Bilski JJ | 1998 | Endocrine1998，8，3： | 1 |
| 9 | Influence of undegraded intake protein on intake,digestion,serum hormones and metabolites,and nitrogen balance in sheep显示文摘 | Swanson K C Caton J S Redmer D A | 2000 | Small Rumin Res2000，35，： | 1 |
| 10 | Expression of the angiogenic factors, basic fibroblast growth factor and vascular endothelial growth factor: inthe ovary显示文摘 | Reynolds L P Redmer D A | 1998 | Anita Sci1998，76，： | 1 |
| 11 | Impacts of maternal selenium and nutritional level on growth, adiposity, and glucose tolerance in female offspring in sheep 显示文摘 | Vonnahme K A Luther J S Reynolds L P Hammer C J Carlson D B Redmer D A Caton J S | 2010 | Domestic Animal Endocrinology2010，39，4： | 1 |
| 12 | Vitamin D: an evi- dence-based review显示文摘 | Kulie T Groff A Redmer J | 2009 | J Am Board Fam Med2009，22，6： | 1 |
| 13 | Gap junctional intercellular communication of bovine granulose and thecal cells from antral follicles:effects of luteinizing hormone and follicle-stimulating hormone显示文摘 | Johnson M L Redmer D A Reynolds L P | 2002 | Endocrine2002，18，3： | 1 |
| 14 | Thyroid hormones and cortisol concentrations in offspring are influenced by maternal supranutritional selenium and nutritional plane in sheep 显示文摘 | Vonnahme K A Neville T L Lekatz L A Reynolds L P Hammer C J Redmer D A Caton J S | 2013 | Nutrition and Metabolic Insights2013，6，4： | 1 |
| 15 | Angiogenesis in the corpus luteum显示文摘 | Grazul-Bilska AT Redmer DA | 2000 | Endocrine2000，12，1： | 1 |
| 16 | Effects of dietary fiber on intestinal growth,cell proliIeration,and morphology in growing pigs显示文摘 | Jin L Reynolds L P Redmer D A | 1994 | J Anim Sci1994，72，： | 1 |
| 17 | Angiogenesis in the corpus luteum显示文摘 | Reynolds LP Grazul-Bilska AT Redmer DA | 2000 | Endocrine2000，12，1： | 1 |
| 18 | Impacts of maternal selenium supply and nutritional plane on visceral tissues and intestinal biology in 180 - day-old offspring in sheep 显示文摘 | Yuuusova R D Neville T L Vonnahme K A Hammer C J Reed J J Taylor J B Redmer D A Reynolds L P Eaton J S | 2013 | Journal of Animal Science2013，91，5： | 1 |
| 19 | Ovarian and uterine characteristics and onset of puberty in adolescent offspring: effects of maternal diet and selenium supplementation in sheep 显示文摘 | Grazul- Bilska A T Neville T L Borowczyk E Sharma A Reynolds L P Caton J S Redmer D A Vounahme K A | 2014 | Theriogeuology2014，81，7： | 1 |
| 20 | Quantifica- tion of lane-to-lane loading of poly(A) RNA using a biotinylated oligo (dT) probe and chemiluminescent detection显示文摘 | Johnson M L Redmer D A Reynolds L P | 1995 | Biotechniques1995，19，5： | 1 |
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