If yes, I could include it once or twice a week to break up the monotony of their usual fare. I think they look at their food dishes and say, "Aaargh...lettuce, cilantro, cucumber, zucchini, and peppers again...are you kidding me?" (They also get the occasional bit of carrot, small serving of fruit, and the limited serves of parsley etc.)
It is a terminological question. Where I am, the word "lettuce" signifies iceberg lettuce and nothing else. "Lettuce cos" is never heard, although romaine is very common. The reason why I asked for the clarification is because, as you probably know, iceberg lettuce, specifically, is harmful for guinea pigs. So that was my concern.
No worries. I know all about the iceberg thing. I was just being thrifty with my typing by putting all the green leafy items that are 1) allowable and 2) not "greens" under "lettuce."
"Romaine" is never mentioned here. It's known as Cos. One of those expat things I had to learn when the locals look at me like I have two heads for asking for an item with terminology that is just not used here. ;)
Pigjes...yeah, I was never a fan of rhubarb as a youngster but like it very much in my ahem, more mature years. Strawberry-rhubarb muffins. Stewed rhubarb. Mmm. Oh well, the pigs can look on in envy. :)
"Iceberg lettuce is best not offered guinea pigs; it is low in nutrients and according to some people, could cause loose stools if given in excess."
I am pretty sure that I have read that the oxalic acid content of iceberg lettuce is unacceptably high. I will have to check my books here. If it were the case that the only "harmful" property of iceberg lettuce is that it is essentially "crunchy water" with no nutritional value, then there could not, by definition, be any harm in feeding it to guinea pigs - as long as they got sufficient nutrients from the rest of their diet.
I am sorry about your guinea pig.