GIANTS Senior Academy maintained their unbeaten start to their First Division campaign with a 44-24 triumph at Oldham.
But the Junior Academy side suffered a surprise 24-18 home defeat to Hull KR.
A key to that reverse was the late calls for several players to the Senior set-up, which caused disruption to the home side's ranks.
But it helped boost the fortunes of the Under 21s, who dominated against Oldham from start to finish.
By half-time the points were in the bag as they led 26-6.
Scrum half Paul Mennell set the ball rolling with a try, converted by half-back partner Thomas Hemingway.
And even though the lively Mennell was then forced to retire with a back injury, it did little to upset the Giants' rhythm.
In the 21st minute Tom Senior raced over for try No2, followed by efforts from Kris Lythes, Matthew Whittaker and Danny Samuels.
Hemingway added two of the goals and Huddersfield were already out of sight.
The momentum continued immediately after the restart as Iain Morrison crashed over for a further converted score in the 44th minute.
Oldham rallied to run in three tries, but the Giants finished the stronger, with Whittaker adding a second and winger Marcus George completing the scoring.
But the news wasn't as bright for the Juniors against Hull KR.
Despite some solid efforts from the likes of Simon George and Jason Southwell, the Under 18s were never able to get into full stride.
But they were always in the hunt as they scored tries through George, Southwell and Chris Clarke and goals from Danny Garside.