This week Dr. Murray Jelinski returns to the podcast for a 2nd week in a row, to discuss a completely different topic.  He will summarize some of his recent research on the value of deworming yearling cattle in Western Canadian pastures.  We discuss the basics of the life cycle of the internal roundworms of cattle and the impact they can have on productivity.

00:00 - 00:45 Intro
00:45 - 02:51  Why the interest in internal parasites?
02:51 - 06:00  Types of internal parasites of cattle
06:01 - 10:27  Life cycle of roundworms
10:28 - 15:54 Difference in species of roundworms and changes in distribution of species
15:55 - 17:50 How do the roundworms impact performance?
17:51 - 22:05  Limitations of the fecal egg count test
22:06 - 27:11 Factors that affect the level of parasite load
27:12 - 34:15  Summary of clinical trial on yearling cattle in Saskatchewan
34:16 -  35:50 Emergence of Haemonchus roundworms in Western Canada
35:51 -  38:31  Risk factors for higher parasite loads
38:32 -  44:23  Recommendations for when to decide if deworming is necessary
44:24 -   45:00 Wrap up