(2nd term) Unit 7

Female gametes or ovum are usually fertile for about ______ hours 25 15 20 30

Gametes containing one half of the genetic material found in normal body cells are called ____________. diploid fulloid haploid

True or False? If an animal becomes frightened or upset, a hormone called epinephrine (adrenaline) is released that inhibits milk letdown.

Ewes are _____ breeders. Spring and Summer Fall and Winter seasonal

Once a cell begins spermatogenesis it takes approximately ____ days to turn into a mature sperm cell ready to fertilize an egg. 30 90 60 120

Three functions of the placenta include: providing nutrients and oxygen to the developing embryo/fetus, removing waste products and producing ______________. membranes parturition hormones organs

True or False? The male’s role is to produce large numbers of viable male sex calls called epididymis.

The _____ or fallopian tubes are found at the anterior end of each uterine horn. testicles oviducts ovaries follicles

_____ occurs between metestrus and proestrus and is the longest period of the cycle. Estrus Puberty Diestrus Parturition

Fertilization consists essentially of the fusion of two cells, the male and female gametes, to form one single cell, the_________. zygote centromere ovaries cytoplasm

Mastitis is a factor which causes a(n) _______ in milk production. no change slight change increase decrease

The _______ functions as a heat regulating mechanism. urethra lobules scrotum testicles

Gestation for a cow is _______ days. 150 330 114 285

Colostrum, the first milk, provides the young animal with ___________. antibodies diseases hormones antibiotics

Fertilization occurs in the _________. udder gamete colostrum oviduct

True or False? During the birthing process, piglets do not orient themselves in any one direction, head or tail first.

True or False? Parturition is the act or process of giving birth.

True or False? The lactation curve is the period during which the mammary glands will not secrete milk.

A distended _________ and swollen vulva are signs of impending parturition. udder uterus fetus placenta

Explain, in a few sentences, why synchronizing estrus can be better for the farmer:

What happens to levels of estrogen during the middle 10-15 days of a cow’s estrus cycle? Estrogen matches progesterone levels Estrogen lowers drastically Estrogen remains the same Estrogen inceases

Looking at the reproductive tract of the cow, what produces the progesterone? Corpus luteum Follicle Ovary Oviduct

When is the correct timing of AI? Same time as standing heat begins 34 hours after standing estrus 12 hours after standing estrus begins 48 hours after standing estrus begins

Why don’t producers use AI? Check all that apply. Cost Too complicated Time & labor Facilities All of the above