TY - JOUR
T1 - Effects of locoweed (Oxytropis sericea) on growth, reproduction, and serum hormone profiles in young rams
AU - Ortiz, A. R.
AU - Hallford, D. M.
AU - Galyean, M. L.
AU - Schneider, F. A.
AU - Kridli, R. T.
PY - 1997/12
Y1 - 1997/12
N2 - Sixteen ram lambs (5 mo old, average BW = 49 ± 1.4 kg) received a control diet (50% concentrate, 13.1% CP) or a diet containing 7, 14, or 21% locoweed (LW, DM basis). Rams were housed in individual pens (2.5 × 3.5 m) in an enclosed facility (14 h light, 10 h dark) with free access to feed and water. After 35 d of LW feeding, rams fed the 21% LW diet ate 1.3 to 1.6 kg/d, whereas rams fed the other three diets ate 1.6 to 2.0 kg/d. On d 35, BW (mean ± SE) were 58.3, 57.2, 57.2, and 55.4 (± 1.5 kg/d) for ram lambs receiving 0, 7, 14, and 21% LW, respectively (P > .20). An inverse relationship for BW (P < .10) and gain (P = .04) was observed 1 mo after LW feeding ended relative to amount of LW in the diet. Serum alkaline phosphatase increased with increasing LW (P < .05), and thyroxine concentration was decreased (P < .05) by LW ingestion. On d 35, serum LH averaged 6.8, 9.9, 11.6, and 9.9 (± 1.8) ng/mL (P = .56), whereas testosterone averaged 3.5, 2.6, 3.0, and 1.6 (± .5) ng/mL (linear effect of LW, P = .05) over a 5-h period after GnRH injection (i.m., 50 μg) in lambs fed 0, 7, 14, and 21% locoweed, respectively. Semen volume, sperm motility, sperm cell concentration, and percentage of abnormal cells did not differ (P > .50) on d 35. One month after the end of LW feeding, a linear (P = .06) decrease in sperm motility and scrotal circumference was observed relative to percentage of prior dietary LW. These data suggest that LW exerts adverse effects on the testes of young rams that may not be evident until several weeks after LW consumption ends.
AB - Sixteen ram lambs (5 mo old, average BW = 49 ± 1.4 kg) received a control diet (50% concentrate, 13.1% CP) or a diet containing 7, 14, or 21% locoweed (LW, DM basis). Rams were housed in individual pens (2.5 × 3.5 m) in an enclosed facility (14 h light, 10 h dark) with free access to feed and water. After 35 d of LW feeding, rams fed the 21% LW diet ate 1.3 to 1.6 kg/d, whereas rams fed the other three diets ate 1.6 to 2.0 kg/d. On d 35, BW (mean ± SE) were 58.3, 57.2, 57.2, and 55.4 (± 1.5 kg/d) for ram lambs receiving 0, 7, 14, and 21% LW, respectively (P > .20). An inverse relationship for BW (P < .10) and gain (P = .04) was observed 1 mo after LW feeding ended relative to amount of LW in the diet. Serum alkaline phosphatase increased with increasing LW (P < .05), and thyroxine concentration was decreased (P < .05) by LW ingestion. On d 35, serum LH averaged 6.8, 9.9, 11.6, and 9.9 (± 1.8) ng/mL (P = .56), whereas testosterone averaged 3.5, 2.6, 3.0, and 1.6 (± .5) ng/mL (linear effect of LW, P = .05) over a 5-h period after GnRH injection (i.m., 50 μg) in lambs fed 0, 7, 14, and 21% locoweed, respectively. Semen volume, sperm motility, sperm cell concentration, and percentage of abnormal cells did not differ (P > .50) on d 35. One month after the end of LW feeding, a linear (P = .06) decrease in sperm motility and scrotal circumference was observed relative to percentage of prior dietary LW. These data suggest that LW exerts adverse effects on the testes of young rams that may not be evident until several weeks after LW consumption ends.
KW - LH
KW - Poisonous Plants
KW - Sheep
KW - Testosterone
KW - Thyroxine
UR - http://www.scopus.com/inward/record.url?scp=0031298495&partnerID=8YFLogxK
U2 - 10.2527/1997.75123229x
DO - 10.2527/1997.75123229x
M3 - Article
C2 - 9419997
AN - SCOPUS:0031298495
SN - 0021-8812
VL - 75
SP - 3229
EP - 3234
JO - Journal of animal science
JF - Journal of animal science
IS - 12
ER -