95 research outputs found
Effect of various dosages of Ralgro® in the suckling period on weight gain during the growing period
We studied how implanting with various dosages of Ralgro® during the suckling period affected gains in the growing period. Preweaning performance was reported in the 1985 Cattlemen\u27s Day Report. All calves, regardless of suckling period treatment, received 36 mg Ralgro® at the start of the growing period. Average daily gains during the growing period were similar for all treatments. Consequently, the added weight obtained from the suckling-period implants was still present at the end of the growing period
Increased EZH2 expression in prostate cancer is associated with metastatic recurrence following external beam radiotherapy
Background
Enhancer of zeste 2 (EZH2) promotes prostate cancer progression. We hypothesized that increased EZH2 expression is associated with postradiotherapy metastatic disease recurrence, and may promote radioresistance.
Methods
EZH2 expression was investigated using immunohistochemistry in diagnostic prostate biopsies of 113 prostate cancer patients treated with radiotherapy with curative intent. Associations between EZH2 expression in malignant and benign tissue in prostate biopsy cores and outcomes were investigated using univariate and multivariate Cox regression analyses. LNCaP and PC3 cell radiosensitivity was investigated using colony formation and γH2AX assays following UNC1999 chemical probe‐mediated EZH2 inhibition.
Results
While there was no significant association between EZH2 expression and biochemical recurrence following radiotherapy, univariate analysis revealed that prostate cancer cytoplasmic and total EZH2 expression were significantly associated with metastasis development postradiotherapy (P = 0.034 and P = 0.003, respectively). On multivariate analysis, the prostate cancer total EZH2 expression score remained statistically significant (P = 0.003), while cytoplasmic EZH2 expression did not reach statistical significance (P = 0.053). No association was observed between normal adjacent prostate EZH2 expression and biochemical recurrence or metastasis. LNCaP and PC3 cell treatment with UNC1999 reduced histone H3 lysine 27 tri‐methylation levels. Irradiation of LNCaP or PC3 cells with a single 2 Gy fraction with UNC1999‐mediated EZH2 inhibition resulted in a statistically significant, though modest, reduction in cell colony number for both cell lines. Increased γH2AX foci were observed 24 hours after ionizing irradiation in LNCaP cells, but not in PC3, following UNC1999‐mediated EZH2 inhibition vs controls.
Conclusions
Taken together, these results reveal that high pretreatment EZH2 expression in prostate cancer in diagnostic biopsies is associated with an increased risk of postradiotherapy metastatic disease recurrence, but EZH2 function may only at most play a modest role in promoting prostate cancer cell radioresistance
Comparison of steer feedlot performance and carcass trait uniformly by method of sorting
Long yearling steers (n=997) of various biological types from two origins were used to
test performance and carcass trait uniformity of unsorted cattle, visually sorted cattle, and cattle
sorted by ultrasound and hip height. No significant differences (P> .05) in initial backfat
uniformity were identified between sorted and unsorted groups; however, very little variation
existed across all treatments (.17±.033 in.). Initial backfat had positive linear relationships with
initial weight and carcass backfat and negative linear relationships with days on feed and daily
gain (P<.05). These data indicate a reliable measurement of initial backfat could be useful for
predicting days on feed and/or carcass backfat in long yearling steers, but economic usefulness
will depend upon the variability of the cattle and the method of grouping
Effect of various dosages of Ralgro® in the suckling period on weight gain during the growing period
We studied how implanting with various dosages of Ralgro® during the
suckling period affected gains in the growing period. Preweaning performance was
reported in the 1985 Cattlemen's Day Report. All calves, regardless of suckling
period treatment, received 36 mg Ralgro® at the start of the growing period.
Average daily gains during the growing period were similar for all treatments.
Consequently, the added weight obtained from the suckling-period implants was
still present at the end of the growing period
Effects of preweaning and post weaning implants on suckling, growing, and finishing steer performance
One hundred and ninety-five crossbred steers were used to compare lifetime
implant strategies and study the effects of implanting during the suckling period on
performance in the growing and finishing periods. There were no differences in
growing period gains when both groups were implanted in the suckling period and
the growing period. However, steers implanted in the suckling period but not
implanted in the growing period had significantly lower gains than all other
treatments including controls. Steers implanted only in the growing period had
better feed efficiency in the growing period than both controls and steers
implanted only in the suckling period.
Steers reimplanted during the finishing period had similar finishing gains
regardless of prior implant treatment, and all implanted cattle gained faster than
controls in the finishing period. Steers not reimplanted during the finishing period
had lower gains than those reimplanted. Implanting in the finishing period resulted
in better feed efficiency.
All implanted cattle that were reimplanted in the finishing period had
higher lifetime gains than controls, but there was no difference between implant
combinations. The only carcass characteristic changed by implanting was quality
grade, which was reduced by all implant combinations with the exception of
implanting only in the finishing period.
Implanting during the suckling period did not reduce cattle performance
during the growing and finishing periods when the steers were also implanted
during these periods. This study emphasizes the importance of implanting twice in
the finishing period to maximize finishing gain and final weight
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