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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.

journal of animal science and biotechnology/journal of animal science and biotechnology

Mammary gland growth and vascularity at parturition and during lactation in primiparous ewes fed differing levels of selenium and nutritional plane during gestation