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I don't know who is trying to pull your leg, but there is nothing in the Domestic Mail Manual restricting the mailing of day-old poultry to the weekends. In fact, the DMM encourages mailing early in the week, to avoid the birds sitting at the PO on a Sunday.
I referenced DMM 601.9.3.2
9.3.2 Day-Old Poultry
Day-old poultry vaccinated with Newcastle disease (live virus) is nonmailable. Live day-old chickens, ducks, emus, geese, guinea fowl, partridges, pheasants (pheasants may be mailed only from April through August), quail, and turkeys are acceptable in the mail only if:
a. They are not more than 24 hours old and are presented for mailing in the original unopened hatchery box from the hatchery of origin.
b. The date and hour of hatching is noted on the box by a representative of the hatchery who has personal knowledge thereof. (For COD shipments made by a hatchery for the account of others, the name or initials and address of the hatchery or the Post Office box number and address of the hatchery must be prominently shown for this standard.)
c. The box is properly ventilated, of proper construction and strength to bear safe transmission in the mail, and not stacked more than 10 units high.
d. They are mailed early enough in the week to avoid receipt at the office of address, in case of missed connections, on a Sunday, on a national holiday, or on the afternoon before a Sunday or holiday.
e. They can be delivered to the addressee within 72 hours of the time of hatching, whether the addressee resides in town or on a rural route or highway contract route.
f. The shipment bears special handling postage in addition to regular postage, unless sent at the First-Class Mail or Priority Mail prices.
g. When live, day-old poultry is to be transported by aircraft, all provisions of the airline tariffs are met and air carriers have equipment available to safely deliver shipments within the specified time limits, allowing for delays en route in air and ground transportation.
h. Day-old poultry, originally shipped by air express or air cargo and then presented for mailing, must be in good condition and prepared as specified in 9.3.2a. through 9.3.2e.
i. Boxes of day-old poultry of about identical size, securely fastened together to prevent separation in transit, may be accepted for mailing as a single parcel, if such parcel is not more than 100 inches in length and girth combined.
So, I say request they mail on a Monday or a Tuesday. My Pet Chicken (I believe) sets eggs specifically to begin hatching on late Sunday/ early Monday, and ship them out that day.