Tuesday, 22 January 2019 06:55

Fresh is best semen trial finds

Written by  Sudesh Kissun
Frozen semen straws in liquid nitrogen. Frozen semen straws in liquid nitrogen.

A field trial using frozen sexed semen didn’t produce the desired results, says LIC.

LIC genetics business manager Greg Hamill says results mean the company recommends farmers use liquid sexed semen.

The blind trial in spring 2017 consisted of nearly 100 farmers and at least 12,000 straws -- sexed and conventional.

The results clearly showed a still substantial difference between sexed and conventional frozen semen: the sexed semen was, on average, 13.3 % down on non-return rates (NRR) compared to standard conventional straws. NRR refers to the proportion of cows not subsequently re-bred within a specified time after an insemination.

With getting cows in calf being one of the most important aspects of dairy farmers’ seasonal focus, the reproductive implications of a reduction in NRR by 13.3% is significant, says Hamill.

“These cows would remain in the dry paddock for at least three more weeks. The reduction in the reproductive performance among the herd may be too great for most farmers contemplating using frozen sexed semen.”

LIC ran the frozen sexed semen trial with Sexing Technologies, the only supplier of sexed semen in New Zealand, using multi-head technology that allows it to sort semen faster and up to four million cells per straw.

Hamill says improvements in the technology of sexing semen are well documented and there was a good deal of anticipation and excitement about what the trial results would show.

LIC had hoped to see the technological improvements reflected in better NRR for dairy farmers. Using sexed semen for breeding has advantages. For many years dairy farmers have been excited about the possibility of using sexed semen to drive genetic gain within their herds, says Hamill.

“This makes sense, because it enables farmer to get more heifer calves from their top performing animals.”

The above factors were key drivers behind LIC’s desire to participate in the trial with Sexing Technologies.”

More like this

LIC ends year with $30.6m profit

Herd improvement company LIC has ended the 2024-25 financial year in a strong position - debt-free and almost quadrupling its net profit.

LIC Space folds for good

Farmer co-operative LIC has closed its satellite-backed pasture measurement platform – Space.

Featured

Dr Mike Joy says sorry, escapes censure

Academic Dr Mike Joy and his employer, Victoria University of Wellington have apologised for his comments suggesting that dairy industry CEOs should be hanged for contributing towards nitrate poisoning of waterways.

People-first philosophy pays off

The team meeting at the Culverden Hotel was relaxed and open, despite being in the middle of calving when stress levels are at peak levels, especially in bitterly cold and wet conditions like today.

Farmer anger over Joy's social media post

A comment by outspoken academic Dr Mike Joy suggesting that dairy industry leaders should be hanged for nitrate contamination of drinking/groundwater has enraged farmers.

From Nelson to Dairy Research: Amy Toughey’s Journey

Driven by a lifelong passion for animals, Amy Toughey's journey from juggling three jobs with full-time study to working on cutting-edge dairy research trials shows what happens when hard work meets opportunity - and she's only just getting started.

National

Machinery & Products

» Latest Print Issues Online

The Hound

Faking it

OPINION: Demand for red meat is booming, while it seems the heyday of plant-based protein is well past its 'best…

M.I.A.

OPINION: The previous government spent too much during the Covid-19 pandemic, despite warnings from officials, according to a briefing released…

» Connect with Rural News

» eNewsletter

Subscribe to our weekly newsletter