This week LONGS-LANG OMAN OMAN (Man-O-Man) received outstanding indexes around the world (#6 TPI and #1 LPI) much like the rumours before this proof round had predicted (Read more – Man-O-Man Will He Turn Platinum?). Now many breeders are again considering him for their breeding programs. While we can totally support the principle of using the best sire to produce the next generation of AI bulls, we are not sure that Man-O-Man will be a great sire of sons. Here’s our reasoning.
When you take a close look at Man-O-Man’s progeny, you find that 6 of his daughters worldwide have a higher gLPI than he has. They are COMESTAR LAUTAMAI MAN O MAN, STANTONS MANOMAN EZRA, SEAGULL-BAY SHAUNA SATURN, BENNER MANOMAN JANESSE, DONNANDALE MANOMAN JAKARTA and STE ODILE MANOMAN MODEL SAPHIR. Three of these daughters have Estimated Breeding Values and three are younger and have Parent Averages. What really stands out and catches our eye is that none of his sons (PA or EBV) have a higher gLPI than he has. In fact his highest gLPI son is almost 5% lower on his indexes than he is. It begs the question, “Will Man-O-Man ever have a son that indexes higher than himself?”
When we look at the current CDN Sires of Top 100 LPI Bulls, we find the following sires are proving themselves as sires of sons.
These previous three sires have produced BOTH daughters and sons, who have surpassed them. Let’s look at another list that is producing top bull mothers but who have yet to produce a legacy son.
The anomaly is Bolton. He ranks high for progeny average LPI on both the CDN List for Top 100 LPI Bulls (#2) and on the Sire of Top 1000 GLPI Cows (#3). However, his ratio indicates that he will work slightly better as the sire of bull mothers.
The past foretells the future. Instead of running out to use Man-O-Man to produce that next great sire of sons, he is better used to generate that next great bull mother. Also, instead of looking to use Man-O-Man sons as the next great sires of AI bulls, breeders should perhaps look at sons out of Man-O-Man daughters . History has shown that some bulls are meant to be bull mothers (Goldwyn, Planet and Shottle) and some bulls are more destined to be sires of sons (AltaBaxter, and Oman). Man-O-Man’s numbers would indicate that he is going to be a better producer of bull mothers.