Line 1: |
Line 1: |
− | {{toplink
| |
− | |linkpage =Reproductive System - Anatomy & Physiology
| |
− | |linktext =Reproductive System
| |
− | |maplink = Reproductive System (Content Map) - Anatomy & Physiology
| |
− | |sublink1=Reproductive System - Anatomy & Physiology#Puberty
| |
− | |subtext1=PUBERTY
| |
− | }}
| |
− | <br>
| |
| == Female Threshold Body Size == | | == Female Threshold Body Size == |
| | | |
Line 40: |
Line 32: |
| * Autumn born lambs do not reach puberty until 10-12 moths of age. | | * Autumn born lambs do not reach puberty until 10-12 moths of age. |
| * This is because, seasonal cues (long days of spring/summer) delay reproductive cyclicity. | | * This is because, seasonal cues (long days of spring/summer) delay reproductive cyclicity. |
− | * Thus, [[Reproductive_Behaviour_-_Oestrus_Behaviour_- Anatomy & Physiology|oestrus]] in both spring and autumn born lambs is synchronised. | + | * Thus, [[Oestrus Behaviour - Anatomy & Physiology|oestrus]] in both spring and autumn born lambs is synchronised. |
| * This maximizes the chance that all ewes become pregnant in the fall and give birth in the spring when nutritional and environmental conditions are favourable. | | * This maximizes the chance that all ewes become pregnant in the fall and give birth in the spring when nutritional and environmental conditions are favourable. |
| * An adequate degree of nutrition ('fatness') is required before photoperiod can exert an effect. | | * An adequate degree of nutrition ('fatness') is required before photoperiod can exert an effect. |
Line 62: |
Line 54: |
| * Onset of puberty occurs in January-February in the Northern Hemisphere, where there is increasing day length. | | * Onset of puberty occurs in January-February in the Northern Hemisphere, where there is increasing day length. |
| * Queens born in February-March do not reach puberty until the following spring. | | * Queens born in February-March do not reach puberty until the following spring. |
− | * Queens born in summer/autumn generally display their first [[Reproductive_Behaviour_-_Oestrus_Behaviour_- Anatomy & Physiology|oestrus]] the following January. | + | * Queens born in summer/autumn generally display their first [[Oestrus Behaviour - Anatomy & Physiology|oestrus]] the following January. |
| * Before this can have effect, there must be adequate nutrition and growth. | | * Before this can have effect, there must be adequate nutrition and growth. |
| | | |
Line 85: |
Line 77: |
| == Environmental and Social Conditions == | | == Environmental and Social Conditions == |
| | | |
− | * [[Attractivity Behaviour - Anatomy & Physiology#Pheromones|Pheromonal]] substances in the [[Normal_Composition_of_Urine_- Anatomy & Physiology|urine]] act as a stimulus to enhance the onset of puberty. | + | * [[Attractivity Behaviour - Anatomy & Physiology#Pheromones|Pheromonal]] substances in the [[Urine Normal Composition|urine]] act as a stimulus to enhance the onset of puberty. |
| * Females reaching puberty in the presence of a male (producing the pheromones) have a greater opportunity of becoming pregnant. | | * Females reaching puberty in the presence of a male (producing the pheromones) have a greater opportunity of becoming pregnant. |
| * Pubertal onset cannot be accelerated using [[Attractivity Behaviour - Anatomy & Physiology#Pheromones|pheromones]] in animals that have not achieved the appropriate metabolic body size to trigger [[Hypothalamus_- Anatomy & Physiology|hypothalamic]] responsiveness to Oestradiol (oestrogen). | | * Pubertal onset cannot be accelerated using [[Attractivity Behaviour - Anatomy & Physiology#Pheromones|pheromones]] in animals that have not achieved the appropriate metabolic body size to trigger [[Hypothalamus_- Anatomy & Physiology|hypothalamic]] responsiveness to Oestradiol (oestrogen). |
Line 99: |
Line 91: |
| * The [[Hypothalamus_- Anatomy & Physiology|hypothalamus]] then gains the ability to produce high frequency and high amplitude pulses of GnRH at an earlier age. | | * The [[Hypothalamus_- Anatomy & Physiology|hypothalamus]] then gains the ability to produce high frequency and high amplitude pulses of GnRH at an earlier age. |
| | | |
− | [[Category:Reproductive System]] | + | [[Category:Puberty]] |
| + | [[Category:Bullet Points]] |