“So, I am curious what it is the the Purina food that works for your dogs reproductively. I was under the impression that grain the kibble could be a source of estrogen that is counter-productive. (Excuse the play on wirds). I would change kibble in a heart beat if that solved the problem. ”
Grain has absolutely nothing to do with the production of estrogen. Soy will produce estrogen like compounds in the body, but quite honestly, if you want a bitch to come into heat, her estrogen levels had better be high. And I personally don’t mind soy, especially for older or spayed bitches, because it keeps their hormones at a more balanced level, since the old gals produce less naturally as they age.
As for ingredients, I honestly could not pinpoint any one in any of the Purina products I’ve tried over the years that “does the trick”, as it were. I’ve used their dry foods from Pro Plan to Alpo, with protein levels ranging from 18-30%, and, like clockwork, bitches who are late to their cycle will come in heat anywhere from within a week to several weeks later, regardless of the brand. Although higher protein, fat and kcals in combination tend to speed this process along.
I do, however, have a theory that there are dog foods which, in my personal experience, seem to cause hormonal issues such as depression of thyroid function, and low carb diets, be they dry, canned or raw, are often a major culprit in irregular cycles. In fact, when I want to speed a bitch out of heat, raw for a day or two will do the trick nicely. Any Purina (dry) product I’ve tried seems to have the opposite effect – in that of balancing the hormone levels, or causing a surge where they previously had been low.
Also, diets that are higher in simple or complex carbohydrates are pure nourishment for the thyroid gland, which has its own functions but is also like a master control for the production of other hormones. And the thyroid is a glutton for sweets. I don’t consider it a breeding food, but when I’ve used Kibbles N Bits, I get the exact same results – instant heat cycles and bitches that stay in full blown heat for a good 10 days.
Anyway, I only recommended Purina ONE because when I was actively breeding, I got the best results with it for brood bitches in particular. I even had a dog with cervical cancer who hadn’t come into heat in almost 2 years, come in after a few days of eating ONE. So, for good or ill, it works like a charm in bringing bitches in season, and the 26/16 ratio seems to be ideal for both pre and post breeding maintenance.
