The retina is a light-sensitive tissue at the back of the eye and is crucial for vision. As RP progresses, the field of vision narrows, a condition known as tunnel vision until only central vision (the ability to see straight ahead) remains. Many people with Usher syndrome also have severe balance problems.
Calves can be ready for weaning by 3 to 4 weeks of age; however, in Penn State studies calves weaned at 3 weeks required extra attention. The increased time and labor required to get these calves eating starter suggest that waiting until 4 weeks of age would be prudent.
It supported the early-weaning concept. We also have collected data from 3,300 calves fed at conventional and moderately accelerated milk replacer programs and weaned at either 4 or 6 weeks. More than 94 percent of the calves in a conventional system were weaned on time with a four-week weaning program (Table 1).More than 99 percent of the calves in a moderately accelerated milk replacer program were weaned successfully with a four-week weaning program.ore than 94 percent of the calves in a conventional system were weaned on time with a four-week weaning program (Table 1). More than 99 percent of the calves in a moderately accelerated milk replacer program were weaned successfully with a four-week weaning program.