Cow-Calf Final Exam 2024/2025 Exam
Questions with 100% Correct Answers |
Latest Update
What are the objectives in selecting replacement heifers? - 🧠ANSWER
✔✔In heifer selection, you want to identify heifers that will conceive early in
the breeding season (meaning they should reach puberty earlier), calve
easily, give a flow of milk consistent with the environment, wean an
acceptable calf, and make positive contribution to the calves postweaning
growth and carcass traits.
We can tell by looking at a heifer if she will be fertile - T/F - 🧠ANSWER
✔✔False
How do I calculate adjusted 205 day weight? - 🧠ANSWER ✔✔(WW-
BW/Age) x (205d+BW+AoD Adj.)
Should I use adjusted 205 day weight to select replacement heifers? Why?
- 🧠ANSWER ✔✔No, favors younger heifers that reach puberty later
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,What is the simple way to select my heifers if I don't have a set of scales? -
🧠ANSWER ✔✔Choose the oldest, visibly larger heifers
In the lab exercise on selecting replacement heifers, why did we cull the
Angus and Brahman heifers out first? - 🧠ANSWER ✔✔
What two factors are most important in selecting heifers? - 🧠ANSWER
✔✔Age and weight
Heifers should reach puberty 1-3 months before being bred - T/F -
🧠ANSWER ✔✔True. The first pubertal estrus is less fertile, so having at
least one cycle before the breeding season is ideal (although 2 cycles is
ideal).
It is not really important when a heifer conceives in the breeding season as
long as she does - T/F - 🧠ANSWER ✔✔False, heifers that become
pregnant early in the breeding season have a higher lifetime production
potential
What are major factors affecting puberty? (list the top 4) - 🧠ANSWER
✔✔Breed, age, weight, and BCS are the top 4 factors affecting puberty in
beef heifers.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
,How does breed impact puberty? - 🧠ANSWER ✔✔In general, dairy breeds
are the youngest at puberty, bos indicus are the oldest at puberty, heavy
milking beef breeds are younger at puberty. There are large variations
within and between breeds.
Can we modify age at puberty by crossbreeding? - 🧠ANSWER ✔✔Yes,
crossbred cows usually reach puberty earlier than their straightbred
counterparts due to hybrid vigor effects. The way to do this is
crossbreeding with another breed that has a similar or younger age at
puberty.
Timing of gain in heifers is not as critical as making sure that heifers reach
their target weight - T/F - 🧠ANSWER ✔✔True. There is currently no
statistical difference in the timing of gain in heifers, meaning they could
gain consistently, gain slowly and then rapidly, or rapidly and then slowly,
and still reach the correct weight at puberty (all timing produces the same
final weight, age at first estrus, and pregnancy rate)
What is the target weight for heifers at breeding? Is this the average
weight? - 🧠ANSWER ✔✔The target weight for heifers at breeding should
be 65% of their mature weight.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, Why should heifers be sorted into management groups (if you have a large
number of heifers)? - 🧠ANSWER ✔✔There are social effects between
heavier and lighter heifers, such as dominance/competition for food.
Heifers should be sorted into heavy and light groups if you have a large
number of heifers to reduce competition, balance their ADG, increase
weight, and overall decrease age at puberty and increase pregnancy rate.
(Pregnancy rates will increase by about 20% in lighter heifers that are
sorted into a different management group)
Calculate the target weight for a set of heifers. - 🧠ANSWER ✔✔Example:
1100 lb mature wt x 65% = 715 lbs at the start of breeding. All heifers in the
set should weigh at least the 715 lbs
Should I implant my heifers? Why? Should you implant all heifers or
replacement heifers? When should you implant them? - 🧠ANSWER ✔✔If
replacement heifers are identified at an early age, don't implant
If replacements are not identified at an early age, implant all between 2
months and weaning
-Heifers not kept as replacements will be heavier
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 4
STATEMENT. ALL RIGHTS RESERVED
Questions with 100% Correct Answers |
Latest Update
What are the objectives in selecting replacement heifers? - 🧠ANSWER
✔✔In heifer selection, you want to identify heifers that will conceive early in
the breeding season (meaning they should reach puberty earlier), calve
easily, give a flow of milk consistent with the environment, wean an
acceptable calf, and make positive contribution to the calves postweaning
growth and carcass traits.
We can tell by looking at a heifer if she will be fertile - T/F - 🧠ANSWER
✔✔False
How do I calculate adjusted 205 day weight? - 🧠ANSWER ✔✔(WW-
BW/Age) x (205d+BW+AoD Adj.)
Should I use adjusted 205 day weight to select replacement heifers? Why?
- 🧠ANSWER ✔✔No, favors younger heifers that reach puberty later
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 1
STATEMENT. ALL RIGHTS RESERVED
,What is the simple way to select my heifers if I don't have a set of scales? -
🧠ANSWER ✔✔Choose the oldest, visibly larger heifers
In the lab exercise on selecting replacement heifers, why did we cull the
Angus and Brahman heifers out first? - 🧠ANSWER ✔✔
What two factors are most important in selecting heifers? - 🧠ANSWER
✔✔Age and weight
Heifers should reach puberty 1-3 months before being bred - T/F -
🧠ANSWER ✔✔True. The first pubertal estrus is less fertile, so having at
least one cycle before the breeding season is ideal (although 2 cycles is
ideal).
It is not really important when a heifer conceives in the breeding season as
long as she does - T/F - 🧠ANSWER ✔✔False, heifers that become
pregnant early in the breeding season have a higher lifetime production
potential
What are major factors affecting puberty? (list the top 4) - 🧠ANSWER
✔✔Breed, age, weight, and BCS are the top 4 factors affecting puberty in
beef heifers.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 2
STATEMENT. ALL RIGHTS RESERVED
,How does breed impact puberty? - 🧠ANSWER ✔✔In general, dairy breeds
are the youngest at puberty, bos indicus are the oldest at puberty, heavy
milking beef breeds are younger at puberty. There are large variations
within and between breeds.
Can we modify age at puberty by crossbreeding? - 🧠ANSWER ✔✔Yes,
crossbred cows usually reach puberty earlier than their straightbred
counterparts due to hybrid vigor effects. The way to do this is
crossbreeding with another breed that has a similar or younger age at
puberty.
Timing of gain in heifers is not as critical as making sure that heifers reach
their target weight - T/F - 🧠ANSWER ✔✔True. There is currently no
statistical difference in the timing of gain in heifers, meaning they could
gain consistently, gain slowly and then rapidly, or rapidly and then slowly,
and still reach the correct weight at puberty (all timing produces the same
final weight, age at first estrus, and pregnancy rate)
What is the target weight for heifers at breeding? Is this the average
weight? - 🧠ANSWER ✔✔The target weight for heifers at breeding should
be 65% of their mature weight.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, Why should heifers be sorted into management groups (if you have a large
number of heifers)? - 🧠ANSWER ✔✔There are social effects between
heavier and lighter heifers, such as dominance/competition for food.
Heifers should be sorted into heavy and light groups if you have a large
number of heifers to reduce competition, balance their ADG, increase
weight, and overall decrease age at puberty and increase pregnancy rate.
(Pregnancy rates will increase by about 20% in lighter heifers that are
sorted into a different management group)
Calculate the target weight for a set of heifers. - 🧠ANSWER ✔✔Example:
1100 lb mature wt x 65% = 715 lbs at the start of breeding. All heifers in the
set should weigh at least the 715 lbs
Should I implant my heifers? Why? Should you implant all heifers or
replacement heifers? When should you implant them? - 🧠ANSWER ✔✔If
replacement heifers are identified at an early age, don't implant
If replacements are not identified at an early age, implant all between 2
months and weaning
-Heifers not kept as replacements will be heavier
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 4
STATEMENT. ALL RIGHTS RESERVED
